GlobalSat BT-308 is a compact and extremely sensitive GPS receiver with built-in bluetooth wireless technology. It operates on a well-known SiRF Star IIe/LP chipset that provides highest sensitivity with the lowest power consumption. With a powerful Li-ion rechargeable battery in place, BT-308 can run for 8 hours continuously. Combining highest sensitivity, maximum power, and wireless freedom, GlobalSat BT-308 is definitely the best choice for your wireless GPS navigation.