FUNCTION:
1. Install the main machine in the fixture of the wristband and wear it on the wrist or arm. Wrist strap can ba adjusted at will.
2. Press the transparent cover button once, and the light will always be on;press again and the light flashes;press again and the light goes out.
3. Remove the main machine from the silicone tape and open the back cover as indicated by the "OPEN" arrow. then replace the battery.