Hittime New Wireless Home GSM Burglar Security Alarm System Autodial Kit 01 Only support 2G GSM. Not support CDMA. Not support 3G (CDMA2000, WCDMA, TD-SCDMA, WiMAX). 4 wired and 6 wireless defence zones. Can preset and store 6 voice phones and 3 message phones. Remote two-way intercom. Telephone (mobile phone) remote control programming. SMS remote control preset & arm/disarm the main panel. SMS alarm content can be changed. 10 groups of timely arm and disarm. 10 groups reply to timely control the home appliances open or close. Can connect wireless siren(Option). 10-second automatic message recording. Built-in intelligent English message. Alarm locking memory and information clear for easy checking. One-key-control function: Out Arm, Home Arm, Remote Arm.