Audio input:built-in omnidirectional microphoneaudio output:built-in loudspeakeraudio quality:noise suppression and echo cancellationvideo parameterscamera:1/4" cmosresolution:720 × 576video frame rate:pal: 25 fpslight supplementlight supplement mode:photosensitive ir supplement, ir range: 2 metersdevice interfacesi/o output:1 relay outputfour-wire interface:1 four-wire interface (1-ch video input, 1-ch audio input/output, 1-ch power
supply, 1-ch grounding)generalpower consumption:max. 5wmaterial:zinc alloyworking humidity:10% to 90%working temperature:-30°c to 70°c (-22°f to 158°f)dimensions(l × w × h):145 mm × 49.2 mm × 26.45 mm (5.7" × 1.9" × 1.0")