The ENFORCER Wireless Intercom is a simple and secure way to communicate between multiple intercoms (up to 16 units) within an area of up to 1,000ft (300m).* The wireless intercoms operate on 4 channels and can either broadcast to all intercoms or to select intercoms on the same channel. Simple and easy setup Encrypted transmission offers security and protection Range up to 1,000ft (300m)* 4 Selectable channels Connect up to 16 wireless intercoms Each intercom has adjustable volume Indicator LEDs show mode and status Powered by batteries (alkaline or rechargeable) or power adapter (both not included) 4 Communication modes: full broadcast to all stations, talk on a single channel, private talk, and hands free Fail-safe design: if an intercom loses connection it automatically reconnects to other intercoms *Line-of-sight range. Actual range may vary depending on the installation and operating environment. Specifications Dimensions 7-1/2″x3-1/2″x1-1/4″ (190x89x32 mm) Weight 5.3-oz (150g) Number of Channels 4 Power 12VDC/500mA adapter (2.1mm) or 1.5V AA alkaline/rechargeable batteries x 4 (both not included) Frequency 902~928 MHz (frequency hopping) Low battery voltage 4.2VDC Maximum RF Power 57.2mW Range 1,000′ (300m)*