Features: The device offers reliable transmission distance and flexible functionality with stable signal performance. Recovery code operation: Press and hold the mute and ringing buttons on the copy remote control simultaneously until the indicator light flashes quickly, then the previously cleared remote control code can be recovered. 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 held down throughout this process). Equipped with SA901B main control chip, supports online programming, can be rewritten repeatedly, built-in EEPROM, capable of copying other common frequency remote controls, allows code learning at any time, easy to use and fast. Suitable for car remote control, light control, smart home remote control, and other applications. Code matching operation: If the remote control has existing codes, they must be cleared before new coding. Press the original remote control button and the corresponding button on the copy remote control simultaneously until the light on the copy remote flashes rapidly and then becomes steadily lit, then release both buttons to complete successful code matching. Specifications: Material: ABS, Metal Battery: DC3V 2032 (Included) Working Temperature: -20 to 70°C Frequency: 315MHz/433MHz Size: Approx. 66x35x15mm / 2.60x1.38x0.59in (Including Cover) Note: (1) Battery voltage must not exceed the operating voltage range. (2) When copying a remote control, keep both remotes close together to avoid copy errors. (3) In environments with strong wireless interference, remote control range may be reduced. (4) Keep out of reach of children. (5) Do not use in humid environments to prevent damage. Package includes: 1x Remote Control