Support: HIKVISION AX-PRO ; Sound pressure level: 90 dB ... 110 dB ; Frequency band: 868 MHz ; Radio communication range (at open area): max. 1600 m ; Color: White ; Power supply: 3 x Battery 3 V CR123A ; Backup time: ~ 3 years ; Operation temp: -10 °C ... 55 °C ; |