20 channel SIRF starIII high sensitivity GPS technology. Tracking sensitivity:-159dBm. Bluetooth versiion 1.2/class 2/Serial Port Profile(SPP). Support wireless(Bluetooth) and Wired(GPS-mouse) dual communication functions. 3-color LED for functional indication. Removable and rechargeable Lithium-ion battery. Operation time:13 hours in continuous mode. Smart power-saving feature. Ultra-compact size:68.3*40.0*17.6mm(L*W*H).