The doorbell uses a 433mhz wireless connection. It is work with Alarm host and Wireless Doorbell Button for Alarm system 

It is mainly used in pair with the Alarm host. When the doorbell button is triggered, the host sends a "BUZZ, BUZZ" full-range wireless transmission, and the wireless transmission distance Max. 100 meters.

Input voltage: ：3V button battery CR2032

Satic current：≤1uA

Alarm current ：≤10uA

Alarm indication：Red LED

Wireless frequency：433MHz（±75KHz）

Transmit distance ：≤100m（in open area）

Working temperature：-10℃〜+50℃

Humidity：≤85％