GMC07 upgraded to support 24V car power. Old model support only 12V power, and will get broken if plug into 24V power socket. Now you can use the new version of GMC07 car gps jammer on any of car cigar lighter sockets. The jamming power of new version GMC07 jammer is same as old verson. Output power is the same.
Click below link to check jammer details and unit prices with shipping cost.
http://chinajammer.com/gmc07-car-vehicle-tracker-jammer.html