Firmware V1.20
Update Notes:Change the display content from Distance 0-20m/1-200m to 0-1m/1-200m.
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.