Self-powered wireless wall switch requires no battery and no wire. It uses the unique energy harvesting technology and ultra-low-power wireless technology with worldwide patents pending. When press button of transmitter, it converts kinetic energy into an electrical energy internal , and then send signal to receiver, you could control the lamp by receiver.
 
Specifications as below:

• 180~260V
• Transmitter: Self-powered
• Operating Temperature: -10~45
• RF frequency: 433MHz