... module (20 channels)2. Support GSM/GPRS (850/900/1800/1900MHz)3. Inbuilt Backup Battery (200~850mAH)4.3 general I/O ... Connecting cable ,GPS antenna ,GSM antenna, Engine controller, SOS button, MicrophonePorts:RES: Reset Button1: ... , we gain orders from Government Purchasing in both domestic market and overseas market.4 ... for free2, Free server service period: 12-month3, We accept OEM and customised orders ...