SAVR. Is it even possible to reduce environmental EM radiation without using Faraday cage?
This product might as well be filled with fu-fu dust for all the good it will do.
The website provides no details of operation or specific ranges covered. It looks like a cheap watch you could buy anywhere for $10 USD. There are devices called 'jammers' that make broad-band noise that can include audio 'pings' as well as RF sweeps, but these toys cost thousands of US dollars.
They in no way substitute or emulate a Faraday cage, they simple garble sound and/or RF so that packet scanners get mostly useless data. Audio 'pings' can make a hidden microphones AGC (Automatic Gain Control) reset to minimum gain over and over again, hopefully frustrating someone listening in, but a professional spy would use many microphones, some with no AGC to confuse.
This SAVR device is a gimmick. It in no way substitutes for or emulates a Faraday cage. A Faraday cage is a real physical structure with defined shielding properties that contains that which is to be protected from incoming radiation and prevent outgoing radiation. The manufacture makes no claims about frequencies that are covered, or not covered. The advertisements consist mostly of marquee 'splash' words and phrases that collectively add up to nothing.