Wireless 2 Gang Switch (blackfinish), Installation-Easy, Battery-Free Wall On/Off Switch Outdoor Waterproof IP67 Wireless Kinetic Switch.Self-supply and dimmable: The non-dimmer/dimmer switch requires no batteries and no power connection. The energy is built up kinetically by pressing the switch. A small structure that can be used with non-dimmable as well as dimmable lights. Through long-press to circularly dim the brightness to suit any activity. Turn on the light again, and it maintains the last light intensity. With this ENER-J light switch, you don't need to pay extra money to buy a dimmer.Multiple lights switches connectable: A receiver (not included) can be connected with up to 10 switches. This allows you to operate a light source with multiple switches. Quite simply as additional switches to existing light switches. Stepless dimming function and storage brightness.Range and Usage: The effective range between transmitter and receiver (not included in the package) is approximate