Double switch: With the multi-switch function, you can control 1 device with 2 independent switches. Wireless, Easy Installation: No wires between switch and receiver/switch and light. Traditional switches can be replaced directly with this device (sticker included). Long distance signal transmission: The effective range between transmitter and receiver is about 0~40 meters (it is effective through 1 wall) for home; and 400 meters for the exterior. (Note: Do not install the switch on a metal surface or the receiver in a metal cover, otherwise it may not receive wireless signals) Battery operation switch, long life: 600,000 times for switch, CR2032 lithium battery can work for 6-8 years. And the battery is replaceable. Note: 1. The signal can pass through 1 wall, not through an iron wall. This switch does not have a dimmer function. The switch is waterproof. But the receiver (size: 4 x 2.5 x 2.3 cm) is not waterproof. It can be placed in a canopy, a junction box, a junction box.