This portable phone jamming gadget allows you to bring the phone jamming box in your pocket and disturb others phone conversation any where. with about 70 USD you can destroy the wireless connection around your 3 meters area.

The gadget use 4 alkaline batteries and can be use for 4 hours continuously.

in US, a company that makes cell phone jamming equipment is asking U.S. lawmakers to change federal laws to allow broader use of jamming equipment by law enforcement officials in the United States. This is mainly because mobile phones are being used as detonation devices. 

In the other hand, when there is emergency, terroist can use the jamming devices to block all the phone calls in that area, no one can call out to ask for help. Oh no, please think twice before you allow everyone to use cell phone jamming.