Letscom D39 True Wireless Earbuds User Manual

Table of Contents

Wireless EarbudsUser Manual

Thank you for purchasing our products.This manual addresses the safety guidelines, warranty and operating instructions.Please review this manual thoroughly before operating your device.

SAFETY AND WARRANTY

Important Safety Instructions

Use of earbuds will impair your ability to hear other sounds. Use caution while using your earbuds when you are engaging in any activity that requires your full attention.
If you have a pacemaker or other electrical medical devices, you should consult your physician before using this product.
This package contains small parts that may be hazardous to children and should be kept out of reach from children. This product is not a toy – never allow children to play with this product. Always store the product out of reach from children. The bags themselves or the many small parts they contain may cause choking if ingested.
Never try to dismantle the product yourself, or push objects of any kind into the products, as this may cause short circuits which could result in a fire or electric shock.
None of the components can be replaced or repaired by users. Only authorized dealers or service centers may open the product. If any parts of your product require replacement for any reason, including normal wear and tear or breakage, please contact us.
Avoid exposing your product to rain, moisture or other liquids to protect against damage to the product or injury to you.
Keep all products, cords, and cables away from operating machinery.
If the product overheats, if the product has been dropped or damaged, if the product has a damaged cord or plug, or if the product has been dropped in a liquid, discontinue use and contact us.
Do NOT use in areas where there are explosive hazards.
Do NOT submerge the earbuds in water. Do NOT expose the earbuds to moving water (e.g., from a faucet, etc.).
Do NOT wear the earbuds while showering or bathing, or when participating in water sports, e.g., swimming, waterskiing, surfing, etc.
This product contains magnetic material. Consult your physician on whether this might affect your implantable medical device.
Leaving the product in hot or cold places, such as in a closed car in the summer and winter conditions, will reduce the capacity and lifetime of the earbuds.
Dispose of the product according to local standards and regulations.
Remember: Always drive safely, avoid distractions and follow local laws! Using the earbuds while operating a motor vehicle, motorcycle, watercraft or bicycle may be dangerous, and is illegal in some jurisdictions, just as use of the earbuds with both ears covered while driving is not permitted in certain jurisdictions. Check your local laws. Use caution while using your earbuds when you are engaging in any activity that requires your full attention. While engaging in any such activity, removing the earbuds from your ear or turning off your earbuds will keep you from being distracted, so as to avoid accident or injury. Do not take notes or read documents while driving.
When using and charging this product, basic precautions should always

be followed, including the following:–Read all the instructions before using the charging case.–To reduce the risk of injury, close supervision is necessary when the charging case is used near children.– Do not expose charging case to water, rain, liquids o r snow.– Use of a power supply or charger that is not recommended or sold by power pack manuf acturer may result in a risk of f i re or injury.– Do not use the charging case in excess of its output ra nge

– Do not use a charging case that is damaged or modified . Damaged or modifiedbatteries may exhibit unpredictable behavior resulting in f i re, explosion or risk of injury.–Do not disassemble the charging case. Incorrect reassembly may result in risk of f i re or injury.– Do not open, crush or expose a charging case to f i re or excessive temperature.Exposure to f ire or extreme temperature may cause explosion.– Have servicing performed by a qualified repair person using only identicalreplacement parts.

WARRANTY

We strives to build our products with the highest attention to detail and craftsmanship. However, sometimes there are occurrences of defect. We are happy to offer 1-year hassle-free warranty to all our products as we continue to make amazing wireless product. Please contact us if you have any questions about our devices.

Package Contents

Wireless earbud s × 1 pair (left and
Charging case × 1
Eartips × 3 pairs (large, medium, small)
Micro USB cable × 1
User manual × 1

At a Glance Microphone

MFB button (multi function button) LED indicatorCharging caseLED indicatorMicro USBcharging portL (for the left ear, master earbudR (for the right ear)Replaceable eartips

Earbud LED Indicator Guide

P ower on : LED indicators stay blue for a second
P ower off : LED indicators stay white for a second
Pairing mode (using both earbuds): LED indicator on the leftearbud flash es blue and white alternately
Pairing mode (using only one earbud): LED indicator on theearbud flash es blue and white altern ately
Connected to a Bluetooth device : LED indicators flash blueeveryevery 77 secondsseconds
LLow batteryow battery: : LED indicatorsLED indicators flashflash whitewhite every every 55 secondsseconds andand a a voice voice reminder reminder promptsprompts every 2 minutesevery 2 minutes
Earbuds are being Earbuds are being ccharghargeded: : LED indicators LED indicators staystay whitewhite
Earbuds are fully Earbuds are fully charged: LED indicators are offcharged: LED indicators are off

Charging Case LED Indicator Guide

Earbuds aretaken out of or put back into the charging case:1-25% battery: LED indicator flash es blue once25%-50% battery: LED indicator flashe s blue twice50%-75% battery: LED indicator flashe s blue 3 times75%-100% battery: LED indicator flashe s blue 4 times

Note:Charging case LED indicator is off when earbuds are beingcharged in the charging case. Charging

Note:Charging case LED indicator is off when earbuds are beingcharged in the charging case.

Charging case is being charged:1-25% battery: LED indicator flashe s blue once every 2 seconds25%-50% battery: LED indicator flashe s blue twice every 2 seconds50%-75% battery: LED indicator flashe s blue 3 times every 2 seconds 100% battery: LED indicator flashe s blue 4 times every 2 seconds

Charging case is fully ch arged:

LED indicator stays blueWearing the

Wearing the Earbuds

Insert the earbud into your ear and rotate to fit comfortably.Ensure the microphone is pointing towards your mouth. Using the

Using the Earbuds

Charge the earbudsWhen you use the earbuds for the first time,remove theinsulating film s on the charging contacts of the earbuds.

Align the charging contacts on the right earbud with thecharging pins on the right side of the case.
Repeat steps 1 and to charge the left earbud
Close the case when the earbuds LED i ndicators are solid white

Charge the charging case

Plug the small end of the USB cable into the Micro USB portof the charging case.
Plug the other end into a USB wall charger or computer (DC
that is powered on.

Notes:

It takes approx. 2 hours to fully recharge the earbuds.
The earbuds and the charging case charge simultaneously.The charging case can be used as a standalone charger.
When the charging case is out of power and you put theearbuds back into the case, the earbuds will not turn offaut omatically. Turn off the earbuds manually.
When the e ar buds are being charged in the charging case andthe charging case is out of power, the earbuds will turn onautomatically. To avoid unwanted power consumption, turnoff the earbuds manually.
When the c harging case is out of power, the earbuds will notturn on automatically the time you take them out of the case.Turn on the earbuds manually.

Power on/off

Power on1) The earbuds are automatically on when you take them outof the charging case.2) Press and ho ld the MFB button s for 2 seconds to turn on

Note:When you use the earbuds for the first time, remove theinsulating film s on the charging contacts of the earbuds, andpower on the earbuds by pressing and holding the MFB buttonson both earbuds for 2 seconds.

• Power o ff

The earbuds are off automatically when you put themback into the charging case.
Press and hold the MFB bu tton s for 4 seconds to turnthem off (when both earbuds are paired with your phone,press and hold the MF B button on either left or rightearbud, the other earbud will be off at the same time)

PairBefore pairing the earbuds withyour phone or otherBluetooth devices, make sure that the Bluetooth version ofBluetooth devices, make sure that the Bluetooth version of your phone or other Bluetooth devices are your phone or other Bluetooth devices are 4.04.0 or higher.or higher.

Pair both earbuds (Pair use)

Make sure the earbud s and your phone or otherBluetooth devices are next to each other (within 3 feet, noobsta cles between)
Turn on the Bluetooth of your phone or other Bluetoothdevices.
Turn on the earbuds (when they are in shutdown state)and the earbuds enter pairing mode (LED indicator on theleft earbud flash es blue and white alternately).
In the list of f ound Bluetooth devices in your phone orother Bluetooth devices, choose ” D 3 9 L” to pair.
Enter “0000” if your phone or Bluetooth device asks youto enter a code to pair.

Notes:

The earbuds will directly enter pairing mode the first timeyou turn them on.
The earbuds will connect to the last paired Bluetoothdevice automatically when they are turned on. Pleaseturn on the Bluetooth of your Bluetooth device beforeturning on the earbuds.
If pairing failed, turn off the earbuds first and then pressand hold t he MFB buttons until the indicator on the leftearbud flashes blue and white alternately and earbudsenter pairing mode. Choose ” D 39 L” in your phone to pair.
When both earbuds are connected to your phone, if youput the right earbud back to the charging case, you canuse the left earbud alone without interruption; but if youput the left earbud back to the charging case, the rightearbud is also disconnected to your phone and you haveto pair the right earbud with your phone again to use theright earbud alone.
When the earbuds are on but not paired with your phoneor other Bluetooth devices, they will exit the pairing modeand be automatically off in 10 minutes.

Pair ONE earbud (Mono Use)

You can use both earbuds simultaneously or use either of thetwo e arbuds alone.

Make sure the earbud and your phone or other Bluetoothdevices are next to each other (within 3 feet, no obstaclesbetween)
Turn on the Bluetooth of your phone or other Bluetooth devices.
Take the earbud out of the charging case.
Turn off the earbud by pressing and holding the MFBbutton for 4 seconds.
Press and hold the MFB button on the earbud until theindicator flashes blue and white alternately and earbudenters pairing mode.
In the list of found Bluetooth devices in your phone orother Bluetooth devices, choose ” D 3 9 L” if you use theleft earbud or ” D 3 9 R” if you use the right earbud to pair.

Note:When the left/right earbud is connected to your phone and youtake the other earbud out of the charging case, earbuds will pairwith each oth er and then link back to your phone automaticallyi n the condition that you have paired both earbuds with yourphone before) .

Next songPress the MF B button on the left or right earbud twice to skip tothe next song.

Play/pause playing songs

Press the MFB button to pause and press the MFB button againto resume playing songs.

Answer/hang up/reject calls

Press the MFB button or operate on your phone to answer anincoming call.
Press the MFB button or operate on your phone to hang upan ongoing call.
Press the MFB button twice to reject an incoming call.
Activate voice control of phoneIn paired state,press and hold the MFB button for 2 s econds .(This function works only when your p hone has voice controlfunction; please refer to the instructions of your phone fordetails.) Trouble

Trouble Shooting

Q:Pairing failed.A:

Put the earbuds back to the charging case and make sure thatthey are off.
Take the earbuds out of the case and they are automaticallyon.
Wait that the indicator on the left earbud flashes Wait that the indicator on the left earbud flashes blueblue and and white alternately and earbuds enter pairing mode. white alternately and earbuds enter pairing mode.
Choose “Choose “DD3939–L” in your phone to pair.L” in your phone to pair.

If the pairing still failsthe pairing still fails, check the fol, check the following points: lowing points:

Make sure the earbuds and your Bluetooth device are next to Make sure the earbuds and your Bluetooth device are next to each other or within 3 feet and there are no obstacles between.each other or within 3 feet and there are no obstacles between.
There are no signal interference nearby (check the question There are no signal interference nearby (check the question “”Connection is not stableConnection is not stable” for signal interference ” for signal interference conditions).conditions).
Try to reboot your Bluetooth device.Try to reboot your Bluetooth device.

Q: EarbudsEarbuds areare connected to phone A, but I want to pair connected to phone A, but I want to pair earbuds with phone B when I am not able to disconnect earbuds with phone B when I am not able to disconnect earbuds from phone A.earbuds from phone A.

Turn off the earbuds by pressing and holding the MFB buttons Turn off the earbuds by pressing and holding the MFB buttons for 4 secofor 4 seconds. nds.
Press and hold the MFB buttons until the indicator on the left Press and hold the MFB buttons until the indicator on the left earbud flashes earbud flashes blueblue and white alternately and earbuds enter and white alternately and earbuds enter pairing mode. pairing mode.
Choose “Choose “DD3939–L” in phone B to pair.L” in phone B to pair.

Q: Connection is not stable.A: Bluetooth signal is transmitted wirelessly a nd signals can beaffected, which results in intermittent sound of earbuds, in thefollowing conditions:

The distance between the earbuds and your Bluetooth deviceis at the edge of the Bluetooth pairable distance.
Transmitted signals encounter obstacles or human bodyblockage.
There are high power electronic devices nearby.
There are other Bluetooth devices and are being turnedon/off nearby.o resume stable connection between the earbuds and yourBluetooth device, try to avoid the above conditions and d o thepairing again following the steps in “Pairing Failed”.

Q : Power runs outA: The earbuds playtime varies according to volume level andaudio content. The following conditions may cause fast powerconsumption

When the charging case is out of power and you put theearbuds back into the case, the earbuds will not turn offautomatically. To avoid unwanted power consumption, turnoff the earbuds manually.
When the e ar buds are being charged in the charging case andthe charging case is out of powe r, the earbuds will turn onautomatically. To avoid unwanted power consumption, turnoff the earbuds manually.

Specifications

Model: D39Bluetooth Standard: V5.0Operating Range: 33 feet/10 meters (No obstacles between)Supporting Protocols: A2DP/HFP/HSP/AVRCPCharging Time: 2 hours ( earbuds ); 2 hour s (chargingTalk/Playing Time: about 3 hours (Varies according to volumelevel and audio content) Charging Voltage: DC 5VBattery Type: Li polymerBattery Capacity: 5 0mA H (ear bud s); 48 0mA H (charging