Quad image 4 camera DVR security system with motion detection , 4 CH DVR Security System

black color quad image 4 camera DVR security system with motion detection Specifications: General specifications for Monitor Model number SP890 Digital type Monitor screen TFT - LCD 7inch RGB color Contrast Ratio 300:1 Brightness 300cd/m2 Operating frequency 2.4GHz - 2.485GHz digital modulation Antenna type All-directional Receiving sensitivity ≤85dB Speaker output 80dBA Power Adapter DC 5 V / 1000mA Working temperature -10℃~50℃ Working humidity ≤85% Weight 425g Dimension