Tag: Heart Rate Wristband

D21 Bluetooth Heart Rate Wristband Instruction Product Specification Chip model: nRF51822 nRF51822( Cortex M0 16MHz)Memory: 256KAcceleration sensor: Three-axis acceleration sensorHeart rate sensor: Green light static heart rate sensorDisplay: OLED 0.66’’ 64×48 DotsMotor: Cylindrical vibration motorKey-press: Touch keyBattery: 80mAh Notice:The wristband contains magnatic component, he who is installed a pacemaker, or have implanted electronic devices, or metal, please do not use it. Please stop…