Dfit D21 Instruction

D21 Bluetooth Heart Rate Wristband Instruction

Product Specification

Chip model,
Memory,
Acceleration sensor, Three-axis acceleration sensor
Heart rate sensor,
Display, OLED 0.66'' 64x48 Dots
Motor, Cylindrical vibration motor
Key-press, Touch key
Battery, 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 using it when any discomfort symptoms happen.
If use substandard charging power supply, will shorten the battery life, and even damage the
battery.
We reserve the right to modify the User Manual without any notification. It is normal condition if
some functions differs from different app versions.
We reserve all the right for the final explanation .

Turn on/off the Wristband

1. Long press the touch key for 4 seconds, users see the Welcome interface. It is touch key,
please do not press the key with strong pressure.
2. Short press the key to enter to the Device Management interface with power off icon at the
top-left corner. Then long press the touch key to turn off the wristband.
3. Long press to choose the function and short press to switch the functions.

Charging

Charger, voltage 5V, electric current 500MA-1000MA
Charging time, 30 minutes.
Connect the chrger with wristband as below.
nRF51822 nRF51822( Cortex M0 16MHz)
256K
Green light static heart rate sensor