Features: The device has decent transmission distance and is quite flexible in functionality, signal stability. Recovery code operation: Press and hold the mute- and ringing button of the copy remote control at the same time- until the indicator light flashes quickly, then the remote control code cleared before can be recovered. Code clearing operation: hold down the unlocking and locking keys of the copy remote control at the same time- until the indicator light flashes quickly, and then press the unlocking key- three time- to clear the code- (the unlocking key- is held down all the time- during this process). Adopted SA901B main control chip, support online programming, can be repeatedly written, built-in EEPROM, you can copy other common frequency remote control, code learning code at any time-, easy to use, fast-, can be used in car remote control, light control, intelligent home remote control and other field. Code operation: If the remote control over the code- needs to clear code to code. Press the copied remote control and single button of the copy remote control at the same time- until the light of the copy remote control flashes from fast- to steady on, then release the two button of the remote control and the code- is successfully match. Specifications: Material: ABS, Metal Battery: DC3V 2032Battery(Included) Working Temperature: -20 to 70℃ Frequency: 315Mhz/433MHz Size: Approx. 66x35x15mm/2.60x1.38x0.59in(Including Cover) Package Includes: 1x Remote Control note: (1) The battery voltage- should not exceed the operating voltage- ranges. (2) When copying the remote control, try to keep two remote control close to each-other; otherwise, copy exception may occur. (3) In the environment with large wireless interference, the remote control distance may be reduced. (4) Keep it out of reach of children. (5) Do not use it in humid environment, otherwise it may cause damage to the remote control.