Holux Mini Water proof Smart Mouse Type GPS Receiver GR-213U Black High performance receiver tracks up to 20 satellites while providing first fast fix and low powe consumption. Compact design ideal for applications with minimal space. A rechargeable battery sustains internal clock and memory. The battery is recharged during normal operation. Users can adjust power-saving percentage (20%~80%), which achieves the best power efficiency. LED display status: The LED provides users visible positioning status. LED ON when power connected