Wireless Portable Navigation System with 8 hours of continuous operation on a single charge ,Marine, Topographical and Air navigation compatible ,Integrated Bluetooth? wireless technology , SiRF Star II/LP high performance and low power consumption chipset ,All-in-view 12-channel parallel processing ,Built-in SuperCap to reserve system data for rapid satellite acquisition ,Supported NMEA 0183 command: GGA, GSA, GSV, RMC, GLL, VTG,GPS/Bluetooth/Battery LED indicators and Non-slip on the bottom ,Built-in Lithium-ion rechargeable battery