This is a perfect mid-level jammer used for small or medium spaces. It's four antennas can block almost all cell phone frequencies including the new 3G phones. This jammers comes complete with a built in cooling system to help prevent any over heating.

Blocking Radius: 40M
Car Charger: N/A
Standard Charger: 110~220V input
Signals Blocked: 869MHz~2170MHz
3G Phones: Supported
Antenna: 3 dBi - Detachable - Qty: 4
Operating Location: Worldwide
Construction: Full Metal Design
Weight: 41.48 oz
Dimensions: 143x252x51mm

Also Included:
High/Low jamming range adjustment
Remote Control