"1. Working frequencies: 860-885MHz, 930-960MHz, 1800-1990MHz. 2. Working frequency bands: CDMA, GSM, PCS1800, DCS1900. 3. Working temperature: -20癈 - +55癈 4. Working humidity: 30% - 95% 5. Working scope: 300~1000 meters.Depends on the Power. 6. Input voltage: DC12V. 7. For police use. "