-Quad-band 850/900/1800/1900Mhz.
-FREE Charge. Open the Door By Auto-rejected
 Phone Calls By Authorized Numbers.
-High Quality Two-way Voice Communication,
 and optional audio.
-Every Family has a Admin Password and
 Authorize 5 Family Phone Numbers.
-User Friendly Design, LED Screen, Alloy Shell ,
 Easy for installation.
-Up to 200 authorized phone numbers,
 Special for Apartments and Residential buildings.
-Affordable Rates with Top Quality.
 No More Wiring Installations
 and other Complex Accessories.
-2 Relay Outputs (NC/NO),Well compatible with
 Electronic Locks and DVR Camera.
-12VDC Power Supply,
 Relay Time Editable (1~300 seconds).
 Default“0s”, means not work.