It is the remote control for 433MHz alarm host only. 5 pcs per 1 order. Transmission frequency:433mhz, chip1527 Launch time: T = 1 second, Transmission Distance: 80M in open area Power supply: DC 3V (CR2032 battery), Emission current: I2 ≤ 12mA Working environments: Humidity: -10 degrees to 50 degrees, Relative humidity: ≤ 90% 【JCHENG'S After Service】30 days Money Refund,1 year quality warrantee and life time tech support. Any question or advise on our product, please feel free to contact us by support@jcheng-security.com, will reply you within 24 Hours. Also, if not clear about setting up, we have teaching video of the alarm series on YouTube, please search 'JCHENG SECURITY' and find us! › See more product details, Manufacturer: Shenzhen Jing Cheng Digital Surveillance Co.,Ltd