http://www.hk-aoli.com/goods.php?id=268

Protect your total privacy with this 8~12m Portable GPS Signal Blocker Jammer ST-GPS. This GPS jammer is of great help for those who worry about the use of GPS trackers or spy recorders around their area. With a small size, this GPS frequency jammer is light weight and easy to carry.

Specifications:

• Passive cooling (completely silent)
• Typical Jamming Radius: 8~12 meters (varies with environment)
• Power Consumption: 36W
• Work Temperature: -40degree to +55 degree
• Size: 100 x 45x 18mm / 4.0 x 1.8 x 0.7in(L x W x H)(not include antenna)
• Frequency: 1500-1600MHz 
• Avetage outputting: 23 dBm
• Channel outputting: -2dBm/30KHz