This device will jam all GPS and GSM signals up to a distance of 50 metres. When activated., it  immediately blockes all types of tracking and navigational devices. This model comes complete with  built in Ni MH battery and charger and can also be powered by mains voltage or cigarette lighter adaptor..
Only GPS jammers will prevent the GPS loggers and GPS/GSM devices to get GPS positions from the Satellites

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Specifications:

Effective range:  Up to 50 meters radius

Input power:  12.0v internal rechargeable battery

Output signal strength:  1 watt

System:  All systems worldwide

Signal source:  synthesized

Operation temperature:  -10c to +50c

Humidity:  5% to 80%

Size:  L 115 x W 62 x H 30 mm approx.

Weight:  300gm

US$ 429.00
UK£ 286.00