Plug-and-play without installing any software Use latest high-sensitivity GPS technology which is 100% legal Alert alarm will be on when detect a speed camera ahead within 300 to 500 meters The alarm will be closed automatically when speed is lower than 30km/h Beep signal will be on when the battery life is low Includes the widest range of speed cameras covering fixed speed cameras in the North American and most EU countries Equipped with 20 parallel channels GPS receiver: -159dB Acquisition time: Hot typically: <2sec time to first fix (TTFF) Warm typically: <35sec (TTFF) Cold typically: <45sec (TTFF) Positioning accuracy: Less than 15 meters Power supply: Standard: 3.6V DC lithium ion battery Internal active GPS antenna With battery alone: 10 to 12hrs after fully charged Operating temperature: -30 to +70° C Storage temperature: -40 to +85° C Relative humidity: 5 to 95%, non-condensing Device size: 51 x 90 x 31mm Weight: 60g