Features: The device offers reliable transmission distance and flexible functionality with stable signal performance. Recovery code operation: Press and hold the mute and ringing button on the copy remote control simultaneously until the indicator light flashes quickly, then the previously cleared remote control code can be restored. Code clearing operation: Hold down the unlock and lock buttons on the copy remote control at the same time until the indicator light flashes quickly, then press the unlock button three times to clear the code (the unlock button must remain pressed throughout this process). Equipped with SA901B main control chip, supports online programming, can be rewritten multiple times, built-in EEPROM, capable of copying other common frequency remote controls, allows code learning at any time, easy to use and fast. Suitable for use with car remotes, light controls, smart home remote systems and other applications. Code matching operation: If the remote needs to be reprogrammed, first clear the existing code. Press the original remote control and the corresponding button on the copy remote control simultaneously until the light on the copy remote changes from fast flashing to steady, then release both buttons to complete the code matching. Specifications: Material: ABS, Metal Battery: DC3V 2032 (Included) Working Temperature: -20°C to 70°C Frequency: 315MHz / 433MHz Size: Approx. 66x35x15mm (2.60x1.38x0.59in) including cover Notes: (1) Battery voltage must not exceed the specified operating voltage range. (2) When copying a remote control, keep both remotes close together; otherwise, copying may fail. (3) In environments with high wireless interference, the operating range may be reduced. (4) Keep out of reach of children. (5) Do not use in humid environments as it may damage the device. Package includes: 1 x Remote Control