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 rechargeable Li-ion battery. The working time can last 15 hours maximum World first ultra strong degree of hardness mirror surface World slimmest Bluetooth Receiver Light, slim and compact Weight:<30g Dimension: 74 x 40 x 9.3 (mm)