Features 1、brand new and high quality. 2、It is a wireless remote control switch, the working way can be change as you like, it is easy to match the transmitter. 3、The 4 channel wireless remote control switch with 4 relays. 4、The volume is small and the performance is stable and reliable, high sensitivity. 5、Applied in auto door, window, lifting equipment, entrance access, up and down controller, alarm system industrial control and security, etc. Specification Features: 1. brand new and high quality. 2. It is a wireless remote control switch, the working way can be change as you like, it is easy to match the transmitter. 3. The 4 channel wireless remote control switch with 4 relays. 4. The volume is small and the performance is stable and reliable, high sensitivity. 5. Applied in auto door, window, lifting equipment, entrance access, up and down controller, alarm system industrial control and security, etc. Specification: Condition: Brand New Model: YK-4 Output Power: less than DC30V/5A, less than AC220V/5A Working Frequency: 315MHZ Remote Distance: About 50m(empty ground) Optional Style: DC5V, DC12V, DC24V, AC220V Weight: Approx. 135g / 4.8oz Size: Approx. 83.8 * 70.9mm / 3.3 * 2.8in Package List: 1 * Wireless Remote Control 1 * Switch Package List