This device will jam GPS L1 signals up to a distance of 6 metres It simply plugs into an ordinary car cigarette lighter socket and is active immediately blocking all types of tracking and navigational devices.  Only GPS jammers will prevent the GPS loggers and GPS/GSM devices to get GPS positions from the Satellites  Specifications: Effective range: Up to 6 meters radius Input power: 12.0v DC via cigarette lighter socket Output signal strength: 200mW System: All systems worldwide Signal source: synthesized Operation temperature: -10c to +50c Humidity: 5% to 80% Size: L 110 x W 62mm approx Weight: 140gm