No need to the wall. Simply install the receiver between power and light . Fits into most wall boxes and junction boxes.It is ideal for remotely turning lights or other hard-to-reach devices on and off. The lifespan of the switch button is 100,000 times. 27A12V battery (included), they can be used normally more than 7,000 times. The control distance can be up to 50M indoors and 150M outdoors even through walls. One receiver can be paired with multiple wireless switches at the same time, so that you can control the same light in different places according to your actual needs in . Each wireless remote control switch has an chip code. So that Multiple sets can be used without interfering with each other in the room. How to get the signal: Step 1: the learning button(on the Receiver) for2 times until the indicator light flashes. : one button on the remote control. Succeed. How to clear the signal: Only : the learning button(on the Receiver) 8 times. the code clearing is successful. Product Application Area: Products can be used in homes, farms, factories, offices, laboratories, supermarkets and so on Remote control Water pump / Fan / Lamp / LED light / bulb / ventilation device/ Electrical equipment / Factory Home Office Ventilation Pump LED Light Working frequency: 433.92MHZ The total load power:Less than 1000W Maximum current: 10A Receiving sensitivity:-108dBM Working method: wireless remote contro Coding method: learning code Modulation method: ASK Working temperature: -10 - +70 Control distance:20-100m(in open area) Note:Installation guide not included, we strongly recommend you professional installation. Color:As Shown Material:plastic Package Contents: 1 * Wirele remote control switch set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.