1) Enhanced GSM/WCDMA Antenna 2) SOS function 3) Support GPS/BDS 4) 4000mAh Big Battery 5) Supporting OEM (customized product) Specifications: 1.Appication: Taxi, Logistics, Tourism 2.Road rescue, Emergency command, management, Highway, Airport, Transport, Oil field and so on. 3.Network: UMTX/HSDPA 850/1900/2100 4.Navigation: GPS/GLONASS/Beidou Bac