Once paired with the Multi-Alert Receiver, the wireless sound sensor transmits a wireless alert signal to the receiver when it detects a "buzz" sound. 
Operates on a Sub-1 GHz RF frequency with a wireless transmission range of up to 300 meters(1,000 feet) in direct line of sight. 
Three sound sensitivities levels: High, Medium, and Low 
Power On/Off button. 
Law battery indicator on the receiver.