... :4G TF (standard), maximum 32GInterfaces: USB 2.0,RS232Application Software: Internet Explorer, Media Player, Chainway AppCentrePhysical characteristicsScreen: 3.2 ... battery (3.7 V/4,000 mAh) Expansion slots: SIM/SAM/Micro SD (TF) card, Indicator: LED, Audio: ... ++ programming using Microsoft Visual Studio 2005&2008 or higher.Software Development Kits (SDK) providedRFID (UHF)Operating frequency: 865 ...