Feature: 1.20 parallel satellite-tracking channels for fast acquisition and reacquisition. 2.Dual function (Bluetooth GPS+ G-mouse) 3.Compatible with Bluetooth Serial Port Profile (SPP) completely. 4.Built-in rechargeable Lithium ion battery without external power supply for at least 10 hours operation. 5.Built-in 850mAh rechargeable battery for memory and RTC backup and for fast Time To First Fix (TTFF). 6.Support NMEA0183 v2.2 data protocol or SiRF binary code. 7.FLASH based program memory. New software revisions upgradeable through serial interface. 8.Provide expand terminal and can contact to other system without Bluetooth devices. Specification 1.Tracks up to 20 satellites 2.Receiver: L1, C/A code 3.Update rate: 1 HZ 4.Antenna Type: Built in Patch Antenna 5.Minimum signal tracked: -159dBm 6.Dimension: 46.3 ?67 ?19 mm 7.Weight : < 56g 8.On/Off switch : Slide Switcher 9.Operation Temperature: -10 ℃ to + 60 ℃ 10.Store Temperature: -20 ℃ to + 85 ℃ 11.Operation Humidity:5% to 95% No condensing