Cheap GSM Cellphone Signal Blocker
Peace and quiet is yours for $166, but only if no-one in the immediate vicinity uses Sprint. The Portable Palm Phone Jammer is small and cheap, however, unlike some of the brick-like monsters we've seen in the past. It has 5-10 meters of signal-crushing range and weighs 70g.
If you need to clear the theater, try this air-conditioner-sized hutch, which jams everything. Bearing in mind, of course, that jamming cellular signals is considered theft, because you don't own the frequency.
The product page warns that "Illegal usage may be affected the emergency caller," and "Avoid to use in public area without notice."
So consider warned yourself.
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