Always know where you are with the miniature GPS receiver that fits on your keychain Powerful enough to work from your pocket or briefcase even whilst your keys are still in the ignition Connects by Bluetoothreg to all Bluetoothreg enabled mobile phones PDAs or netbooks Compatible with all known mapping software that can be downloaded to mobile phones Uses the MTK 51-channel GPS receiver Up to 10 hours use from one charge Charges via your computer or in the car in-car charger and USB cable provided Measures just 46l x 32w x 14.7d mm and weighs only 22g SpecificationsGPS chipsetMTKGPS channels51GPS sensitivity-158dBmCold start36 secondsWarm start33 secondsHot start1 secondGPS protocolNMEA-0813 V3.01 -GGA GSAGSV RMC DefaultDGPSWAASEGNOSMSASPowerBuilt-in rechargeable Li-ion batteryBluetoothregV1.2 compliant class II 10m rangeOperating temperature-10degC to 60degCStorage temperature-20degC to 60degCCharging temperature0degC to 45degC