Built-in MTK low power consumption GPS chipset 51 parallel satellite-searching channels for fast acquisition and reacquisition Superior sensitivity up to -159dBm Built-in WAAS/EGNOS Demodulator without any additional hardware Compatible with Bluetooth Serial Port Profile (SPP) completely Support NMEA0183 V 3.01 data protocol Built-in changeable & rechargeable Li-ion battery. The working time can last 20 hours maximum Weight:<50g Dimension: 65 x 41 x 16.8 (mm)