CHAMBERLAIN RWIS/0281 WIRELESS INTERCOM (4-CHANNEL WIRELESS INTERCOM)

1, 000-FT WIRELESS RANGE FROM UNIT TO UNIT; 2-WAY DIGITAL WIRELESS VOICE COMMUNICATION; ULTRA-CLEAR SOUND ;QUALITY; SINGLE OR MULTI-CHANNEL COMMUNICATION; UNLIMITED UNIT EXPANSION; CONNECTIONS ARE DIGITAL & FULLY SECURED; VOLUME CONTROL; SECURE 900 MHZ RADIO LINK; INTERCOM SYSTEM ;DOES NOT REQUIRE A WALL POWER OUTLET; 4-CHANNEL INTERCOMS REQUIRE 4 AA BATTERIES PER UNIT; FLUSH-MOUNT INTERCOMS REQUIRE 4 C BATTERIES PER UNIT SUBCATEGORY2: WIRELESS OBSERVATION. Warranty: ONE YEAR.