1、[Easy To Use] We have made the transmitter and receiver work together and tested it, when you get it, you don't need to do anything, just install it, which is very convenient. 2、[Widely Applicable] Suitable for remote control electric door and window, industrial control, lifting equipment, 12V batteries, low voltage DC power supply switches, etc. 3、[Direct Control] This relay remote control switch is very suitable for direct control of various loads, 433MHz working frequency, and the remote control has built in 4 CR2016 75mAh batteries. 4、[Large Range] Wireless RF remote control adopts radio frequency technology, the signal is stable, and the maximum obstacle free range is up to 20‑50m/66‑164ft. 5、[Stable Performance] The signal of the radio frequency switch can pass through wall, floors and doors, and control the receiver stably from any place within a reliable distance. 1 x Relay2 x Remote Control1 x Manual Item Type: Relay Remote Control SwitchWire Material: ABSWorking Voltage: DC12VMaximum Load: 40ARelay Channel: 1CHWorking Frequency: 433MHzReceiver Sensitivity: -105dBWorking Temperature: -20℃-+80℃Built in Button Battery of Remote Control: 4 x CR2016(75mAh)Application: Suitable for remote control electric doors and windows, signal control, industrial control, lifting equipment, 12V batteries, low voltage DC power supply switches, DC LED light and electrical control circuits for low voltage power supply systems, as well as various 12V equipment Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.