General description C1257 module chips, learning code encoder, a good replacement for your current remote controllers. This 5 Pack 4 Channel 433MHz Black Wireless RF Remote Control is designed for versatility and ease of use. Technical specifications Channels: 4 Frequency: 433 MHz Chip type: C1257 Compatibility and accessories Widely used in vehicle central locking systems Compatible with garage doors Works with electronic gates Suitable for electrical appliances Can be used for car sunroofs and heating systems Other information 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 the store, please check for a signal light and ensure the confirming method is the same as ours.