I am to work in Aurora Wireless Technologies, is a company of technology (R & D), and always is try to improve the last product.I want to buy CDMA and GSM modules for telemetrics applications, and GSM for tracking aplication.We have some products for system tracking, like:PCT15: no have tracking, only GSM SMS alarm.PCT20: GSM SMS alarm and location for triangulation in GSM cell, allow customize and configurated for SMS.PCT22: GMSSMS alarm, location for triangulation in GMS cell and GPS tracking, allow customize and configurate for SMS.PCT25: CDMA (1X data and SMS), alarm, GPS tracking, and configurated for data and sms.All products have a backup battery.