Chamberlain Ndis Wireless Doorbell & Intercom System - Observation & Security
CONVENIENT EXPANDABLE COMMUNICATION INSIDE OR OUTSIDE A HOME; 1000-FT RANGE WITH NO WIRES OR POWER CONNECTION; CLEAR SECURE 900 MHZ DIGITAL COMMUNICATION; FULLY SECURE CONNECTION; EASY TO USE INSTALLS IN MINUTES; EXPANDABLE WITH UP TO 12 UNITS PER NETWORK; 2-YEAR BATTERY LIFE REQUIRES 4 AA BATTERIES PER UNIT; INCLUDES 2 WEATHER-RESISTANT WIRELESS PORTABLE INTERCOMS; 1-YEAR WARRANTY