Firmware V1.30

Update Notes：Added the function of long-pressing the middle key for 2 seconds to lock or unlock. The power key will not be locked, and the lock/unlock state will not be retained after restart.

Firmware V1.20

Update Notes：Add 1.2V and 1.5V battery options.

Firmware V1.40

Update Notes：Added the function of long-pressing the middle key for 2 seconds to lock or unlock. The power key will not be locked, and the lock/unlock state will not be retained after restart.

Firmware V1.30

Update Notes：Add 1.2V and 1.5V battery options.

Firmware V1.09

Update Notes： Improve wireless communication.

Firmware V3.00

Update Notes：Improve wireless communication.

Firmware E4C_V0.9; E4N_V0.8； E4S_V0.7； E4O_V0.7； E4P_V0.7； E4F_V0.8

Update Notes：Improve signal transmission stability.

Firmware VC.1

Update Notes： Improve signal transmission stability.