Imou by Dahua ARD311-SW-IMOU IMOU magnetic contact

Opening distance: 25 ~ 45mmRadio frequency: 433MHzTransmission Power: 10dBmTransmission range: 200 meters in open fieldAlarm warning by LED indicatorPower: 1 CR2123A battery (included)Battery life of up to 3 yearsCover and rear tamperOperating temperature: -10°C ~ 55°CRelative humidity: <95%, without condensationDimensions: 39 (W) x 84 (H) x 20 mmWeight: 10gScrew or adhesive installation