Version 1 :it was designed most of Asia 4G FDD:B1/B3(2100/1800mhz) 3G UMTS/WCDMA:B1(2100Mhz) Version 2 :it was designed Asia and Some EU Country 4G FDD:B1/B3/B8(2100/1800/900mHZ) 4GTDD:B38/B39/B40/B41(2600/1900/2300/2500Mhz) 3G UMTS/WCDMA:B1(2100Mhz) Version 3 :it was designed RU ,Asia, EU Middle East 4G FDD:B1/B3/B7/B8/B20(2100/1800/2600/900/800Mhz) 4G TDD:B38/B39/B40/B41(2600/1900/2300/2500Mhz) 3G WCDMA:B1/B8(2100/900MHZ) US Version:it was designed for USA/CA/Mexico 4G LTE:B2(1900)/B4(1700/2100)/B5(850)/B12(1900)/B17(700) 3G WCDMA:B5(850MHZ)   Specification Main Chip   - WIfi parameters: 802.11b/g/n - Supported users 10 users - Antenna Built-in 4G dual antenna - Encryption WPA/WPA2 - Size 96.5*58*17.5mm - Network and the frequency band TD-LTE、LTE-FDD、TD-SCDMA、WCDMA、GSM - Transmission rate Peak rate UL/DL:50Mbps/150Mbps - The interface type Micro USB 2.0 - Expandable memory card The biggest 32G   - The power adapter Input voltage 5V，Input current 1A - The battery specification: 3.7V/2400mAh - Standby time: About 48 hours - Work time About 6.8 hours - Charging time About 2.4 hours - Supported by the operating system Windows8/Windows 7/VISTA/XP(Version SP2 and above) - Working temperature -10°C～+45°C - Storage temperature -20°C～+70°C