It's awesome, it works. I don't have a radiation detector to see if it actually blocks them but when I open the jammer, calls don't connect. The quality is good, the technology works, and it's sturdy and easy to carry :)
Review 8341HA-4 4 Bands Cell Phone GPS WiFi Jammer
As powerful and versatile as I just expected
Due to the strong signal from my coffee shop, the interference distance cannot reach 20m, but it can still meet my needs.
Just got these today- going to give them as Christmas gifts to those I cherish in hopes they can stave off spies and thieves who zap chip card info with their phones.
It's very compact and easy to carry. I tested it several times after receiving it. Successfully blocked my cell phone signal.