Features 1、Built-in backup battery, long use time 2、Built-in high gain LNA, dual LDO 3、Adopting PCB gold-sinking process to radiate GPS signal over a large area, the signal is better and more stable 4、VK172 automatically adapts to the baud rate, supports data output at any baud rate 5、With optional baud rate 4800 (not recommended), 9600 (recommended), 19200, 38400, 5700, 115200 and other speeds, it makes your use of this product easier Specification Item Type: External GPS Module Support Operating System: for win10 for win8 for win7 for winXP (for CE, for Android system needs to develop its own driver, no additional support) UB-172 automatically adapts to the baud rate, supports data output at any baud rate Support for Google Earth Model: VK172 C / A code, 1.023MHz code stream Receiving Frequency Band: L1 (1575.42MHz) Tracking Channels: 56 Support DGPS (WAAS, EGNOS and MSAS) (Built-in button battery, LR44, 160mAh) Positioning Performance: 2D Plane: 5m(average) 2D Plane: 3.5m (average), with DGPS assistance. Drift: <0.02m / s Timing Accuracy: 1us Reference Coordinate System: WGS-84 Maximum Altitude: 18000 meters Maximum Speed: 500m / s Acceleration: <4g Electrical Performance: Tracking Sensitivity: -162dBm Capture Sensitivity: -160dBm Cold Start Time: 29s(average) Warm Start Time: 28s(average) Hot Start Time: 1s(average) Recapture Time: 0.1s(average) Operating Temperature: -30℃ to + 80℃ Package List 1 x USB GPS Receiver