Cell phone signal jammer

As the most popular cell phone signal jammer, this product has a small size, easy to carry. Can block 8 bands frequencies, and have a very large jammer range. With a separate frequency control switch, you can turn on or off the frequencies you want to jamming as needed. With car charger, it can be used while driving. This product has the perfect heat dissipation system, it can run continuously for a long time. The shell is made of heat-conducting metal with good heat dissipation. 

https://www.perfectjammer.com/all-cell-phone-jammers-blockers.html