1) Avoid violent collision, extrusion and stay away from strong magnetic field

2) Pay attention to moisture-proof

3) Communication port to avoid debris entry

4) When the battery power is insufficient, the handheld will prompt you to charge it in time

5) When the user program cannot run normally, the system program and application program should be reset

6) Do not disassemble the hand-held device without authorization. 

In case of failure, contact after-sales personnel in time.