Detailed Product Description Applications: Museums, Libraries, Lecture rooms, Prevent students from sms cheating, Theatres, Schools universities, Restaurants, Places of worship, Country clubs, Sporting events, Recording studios, Tv stations, radio stations Technical specifications: 1. Effective shielding range: 2-10meters radius 2. Isolation bandwidth: CDMA: 869-894MHz GSM: 925-960 MHZ DCS:1805-1880MHZ WCDMA:2110-2170MHZ PHS:1900-1925MHZ PCS:1930-1990MHZ 3. Operation temperature: -40c to +55c 4. Humidity: 30% to 95% 5. work time:2-2.5hours