describe Unique design: 433MHz RF wireless remote control switch. Stable and reliable performance, receiving sensitivity (>-105dBm). Strong signals can pass through walls, floors and doors. It can pass through walls, floors and doors to control the receiver from any place within a reliable distance. Easy to use: Very easy to set up and reset. There are 3 working modes (momentary/switch/latching mode) to choose from. You can easily set up the working mode of the product yourself according to your needs. The project has been set to latched mode. The ON button lights up and the OFF button turns off. High sensitivity: The receiver uses a 30A relay, which can load high-power electrical appliances and ensure long-term stable control. Each receiver can store about 20 transmitters. And one transmitter can also control multiple receivers (the transmitter must match the receiver). High quality: High-power terminals can withstand 30A current and can work normally even if the current is unstable.