While it's a bit bulky, not really something you can carry in your pocket putting in anywhere exposed does the job extremely well. I'm on a floor which is much larger than 20Meters and is all open floor plan, I turned it on and sure enough within a few seconds people were looking at there phones with that dumb look on their face trying to redial over and over until they realized they had no signal lol. I would recommend this jammer for sure. The only issue I noticed is that with T-Mobile the service didn't go out to 0 bars, went down to 1 but wouldnt place or receive calls, 4g went offline asap. Date Added: 09/01/2015  by Maxwell Haneline

Great product, works exactly as promised, and was delivered on time. Cheap price. Surprise you!!! Date Added: 09/01/2015  by Frank Davis

Cheap and good service here.Looking so nice! Date Added: 09/01/2015  by Jim Huerto

Just the one I want, have tested it and everything goes on well!Definitely recommend it to a friend! Date Added: 09/01/2015  by Dylan Capelo

Thanks so much for get me away from radiation signals.Great goods！ Date Added: 08/31/2015  by dwayne powers

12 months for the warranty of the product and 6 months for the warrantty of the battery. Really good warranty pllicy. Will come and buy again! Date Added: 08/29/2015  by Bart Henson

The jamming function is really as described, really a formidable jammer device. Date Added: 08/29/2015  by Garret Urbanek

"Thanks for the excellent after sale service, now I know how to use this jammer clearly and thanks for the user manual you have sent to me! " Date Added: 08/29/2015  by Foster Thiele

all of the anti-tapping and anti-tracking frequencies, as well nice customer service Date Added: 08/28/2015  by Eleanore Sposito

Good price and quick delivery.The quality is very good. Date Added: 08/28/2015  by Dorisha Levi