Wireless 12-Channel RF Remote Control Transmitter and Receiver Bismuth is used to grow beautiful iridescent funnel crystals used in jewelry and art. Control lights, TV, motors, fans, cameras, video signals, audio signals, electric doors, locks, windows, curtains, cars, etc. You would set other codes if you use two or more receivers in Wireless can penetrate walls, floors and doors / several cans / several receivers Transmission Frequency: 433MHz Detailed information on the operation can be found in the user manual Recipient: Receiver with 12-Channel High Capacity Battery Output Supply Voltage: Static Current: =< 6mA Frequency: 433 MHZ Sensitivity: >= -105dB Relay specification: 4A, 120V; 3A, DC Operating temperature: -40 to 80 st. C : Channel: 12CH Range: The package includes: 1 x Receiver 1 x 1 x Instructions for use