?Audio and Alarm Interface Available?Audio:1 input (line in),two-core terminal block,max.input amplitude:3.3Vpp,input impedance:4.7KO,interface type:non-equilibrium;1 output (line out),two-core terminal block,max.output amplitude:3.3Vpp,output impedance:100O,interface type:non-equilibrium.Alarm:Visual alarm,1 input,1 output (max.24 VDC/24 VAC,1A).To drive speaker and alarm other controllers,you can use this interface,and alarm output can be linked with other equipment to control home appliances. ?Built-in Two-way Audio?Provide real-time security via built-in two-way audio.You can communicate with the intruders Via built-in two-way audio.Audio and alarm interface available,provide real-time security to your family,Warehouse,Transformer Substation,Border,Residential Area,Parking Area,Building. ?Active Strobe Light and Audio Alarm?Active strobe light and audio alarm to warn intruders off.When the VCA rules are triggered,cameras are able to warn the intruders off and acquire clear facial information through the strobe light and audio alarm.Even better,these cameras can broadcast custom voice messages to warn trespassers to leave a restricted area. ?AcuSense Technology?Focus on human and vehicle targets classification based on deep learning.AcuSense technology helps you take security to the next level with accurate,real-time threat detection that distinguishes people and vehicles from other targets.Combining Colorful technology with AcuSense,these cameras capture human & vehicle targets with vivid color.Connected to Hik back-end products,users will enjoy detailed video playback and efficient footage searches. ?4MP 2K 24/7 Colorful?High quality imaging with 4MP resolution,24/7 colorful imaging.Color technology provides 24/7 vivid colorful images with F1.0 advanced lenses and high performance sensors.F1.0 super-aperture collects more light to produce brighter images.Advanced sensor technology can vastly improve the utilization of available light.Guarantees focusing performance in the mass production of ultra HD Color enabled cameras,providing good quality control.