http://www.hk-aoli.com/goods.php?id=258

Specifications:

• Passive cooling (completely silent)
• Mobile phone signal jammer for completely stopping all of those pesky cell phone calls
• This is a perfect device for all those areas that require quiet including meeting rooms, museums, theaters, churches, classrooms, and is designed to either be used on a table top or inconspicuously placed on ceilings
• High/low jamming range adjustment
• Typical Jamming Radius: 10 ~15 meters (The jamming Radius still depends on the strength signal in given area)
• Covering Frequencies: 850-894Mhz (CDMA); 925~960Mhz (GSM); 1805~1990Mhz (DCS/CDMA1900); 2100~2170Mhz (3G)
• Mobile Phone Signal Jammed: CDMA, GSM, DCS, PHS
• Max Output Power: 10W (high setting), 7W (low setting)

Package Included:

• 1 x 15m Cell Phone Signal Blocker/Jammer
• 1 x AC Adapter
• 4 x Ultra Hi-gain Frequency Specific Antennas