... to 4 cameras- Support QUAD View - With 8 IR LED, this camera can work both day and ... Image Sensor :1 / 3 inch CMOSLens :Focal length: 2.8 mm Angle: 48 ~ 55 degreesFrame Rate :15 ~ 25 ... when signal is stronger)Audio Sampling Rate :16 K, 8 bitAudio Frequency Response :100 Hz ~ 3 kHzPower Strength ... RGB Color LCD Audio Sampling Rate :16 K, 8 bit Signal Strength Indicator :4 LevelsDigital Zoom :3x Earphone ...