... 3, Rolling code 4, Safety auto-Reverse ,roller door operator garage door opener 1, Inpout Voltage : AC230/110V selectable2, ... automatically,reverses should the downward movement of the door be restricted. The overload force is adjustable13, ... door in the case of a power failure18, Waterproof function19, Easy installation20, OEM, ODM is welcomed. roller door opener, roller door operator, garage door ...