C1257 module chips, learning code encoder, a good replacement for your current remote controllers. 4 channels, 433 MHz frequency. Widely used in vehicle central locking systems, garage doors, electronic gates, electrical appliances, car sunroofs, heating systems. Before purchasing, please confirm whether the operating frequency, chip type, and vibration resistance of your transmitter are consistent with ours. If your receiver is not in my store, please make sure whether there is a signal light on it, and whether the confirming method is the same as ours.