【Great Design】433Mhz RF Wireless Remote Control Switch. Stable and reliable performance with high receiving sensitivity (>-105dBm). Radio frequency signal transmission. Strong signal can pass through walls, floors, doors, panels, etc. It can be controlled within 50 meters without obstacles. 【Easy to Use】: Extremely easy to set up and reset. There are 3 working modes (momentary/toggle/latching mode) can be set up. You can easily set up by yourself according to your demands. The working mode of the product is adjustable. This item has already been set up in toggle mode. It can also be set up in mix mode. Such as 2 channels momentary mode and 2 channels toggle mode. 【More Flexibility】This receiver contains 4 relays, and there are 3 terminals (normally open, common, normally closed) for each relay. These 4 relays are independent, so you can control each of them independently. Each receiver can store about 20 transmitters. And one transmitter can control multiple receivers. For example,