1pc connect ceiling lamp learning receiver with on/off function (ceiling fixed) + 1pc 3-channel transmitter Specifications:1) Connect ceiling lamp learning receiver with ON/OFF function 2) Receive range: >20m, self-learning function, learning code: 1 million3) 230V AC/50Hz, 4,333.92MHz, 1,000W/300W(Dimmer)4) Material: PC5) Transmitter: 3 channels6) Battery: A23,12VPacking: Blister