101J Wireless signal detector Operate time: 2-3 hours continuous Semidiameter of interception: 1-10 ... AC adapter (AC 110-240V DC5V) Operate time: 2-3 hours continuousSemidiameter of interception: 1-10 m(-75dBm) Antenna ... room, school, cinema, theater, museum, hospital etc.2. Places where using mobile phones is prohibited such as ... etc 101J Wireless signal detector Operate time: 2-3 hours continuous