NO more Wasting time at Work!! Are they Spying you? Cell Phone Detector 2G,3G,4G Bands (2,4,5) [ wall transformer ] Optional: add a portable 12vdc (not included). Adjustable Zone for detection of cell phones Dimensions 3.5"L x 3"W x 1.1"H TAME BULL GHZ cell phone detectors DETECT CELL PHONES SMARTPHONES IN USE. INCREASE PRODUCTIVITY and SECURITY. (TBGHz is Legal and Jammers / Blockers are ILLEGAL). We Designed , Patented and Made TBGHz in USA , Detect cell phones In: Restrooms , Classrooms , Boardrooms , Waiting rooms , Prisons , Government Buildings , Airports , Theaters , Jails , Rental cars , School Buses ,Trucks , Embassies , etc.. Install a Tame Bull GHz (TBGHz) in minutes and NO more: KILLING TIME , WASTING TIME , GOOFING OFF , LOAFING , SLACKING ,..........at work !!! or Spying !!! Made in USA CELL PHONE DETECTORS TBGHZ ARE LEGAL