This item must work with alarm system,it can not work independent. Power supply: 2 CR2016 button batteries Modulation method:ASK Wireless frequency: 433MHZ launch distance: 100M (open space) Encoding method: HS1527, oscillation resistance 220K Quiescent current: <1uA Operating current <20mA Material: ABS Operating temperature: 0- +50 Relative humidity: 10% -95% Dimensions: 58x35x12mm Super quality widend keys to avoid misuse Professional optimize circuit design Apparently improved signal intensity Coding IC 1527 Operating frequency:433MHz Laboratory button tested 100000 times Sliver:1*Wireless remote control(battery include) Dark Grey:2*Wireless remote control(battery include) Lavender:4*Wireless remote control(battery include) It can work with all the alarm system in our KERUI official store