– Handsfree outside doorbox
– Allows you to answer door from any phone in house/office
– Features enhanced weather protection
– Residential and business door security
– Gate communication
– Use with Viking’s C-1000B, RC-2A, or RC-3 to operate electronic door strikes
– 24 volt talk battery
– 20 Hz ring generator
– Microphone volume adjustment
– Adjustable number of rings (1-7) 3.0 REN