Features: Control your devices with ease using this DC12V Single Channel RelayModule RF WirelessSwitch set. With a selflock function and 433/315MHZ frequency, thisswitch ensures sensitive and strong signal receiving and transmission. Thisswitch is for elevating controllers, automobile, household appliances, machine tools, alarm system, and other automatic control areas. Enjoy the convenience of remotely controlling your devices from up to 50m away without obstacles. Made of quality plastic, thisswitch is both durable and simple to use. Specifications: Material: plastic Standard: 433/315MHZ(optional) Note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xRemote Control RelaySwitch