Holux Mini Smart Mouse Type GPS Receiver GR-213U by Koolertron SiRFstarIII chipset with embedded ARM7TDMI CPU available for customized applications in firmware 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. User initialization is not required.LED display status: The LED provides users visible positioning status. LED ON when power connected and BLINKING when GR-213U got positioned.Water proof design for industry standard.