Features: Easy to use, the 4-channel remote control system allows control of various devices such as cars, home systems, and garage doors. The product uses a 27A 12V battery; replace the battery when the remote control range decreases. This remote control is compatible with 433MHz fixed code key fobs. 4-Channel RF Wireless Remote Control Duplicator for Cars, Garage Doors, Gate Doors, Alarm Systems, and more. This is a fixed frequency remote cloner (433MHz) designed to copy common fixed code and learning code remote controls. Specifications: Material: ABS, Metal Working current: 10mA Radiation power: 10mW Transmission frequency: 433MHz Transmission distance: 50-100m (open area, receiving device sensitivity: -100dBm) Encoder type: Fixed code, Learning code Color: ABCD button / Lock button / Number 1234 / Up and down buttons Function: Copy remote control / Test remote control / Duplicate remote control Size: Approx. 5.4 x 2.9 x 1.4cm / 2.13 x 1.14 x 0.55in