Image Sensor: 1/3” 1.3MP CMOS; 2.8mm Lens; Day/Night: Color Image; Audio Input: Omnidirectional Mic; Audio Output: Built-in Speaker; Bidirectional Talk: Support Dual-way Bidirectional talk; Door Control: 2(1 relay out for main lock, 1 extended by access control module); Alarm In: 2(1ch unlock button, 1ch feedback); Tamper Switch: 1; Material: Stainless Steel; Power: DC 12V; Dimensions: 129.9mm×32.2mm×140mmen