Resolution4.0mp high definition image,clear and fine images.Max image size 1920*1080.Work only on 2.4g,not 5g. - audio recordcan record the sound around the camera,most other cameras do not support audio record.Clear listening effect, save voice evidence, true sound reproduction, clear detail recording, help you record important sound evidence. - motion detection alarmthe camera detects the moving person.Send a mobile phone alarm message. - ptz controlcan rotate 355 degrees horizontally and rotate 90 degrees vertically.The mobile phone can control the rotation angle of the gimbal and see the direction you want to see. - two-way audio communicationfilter noise, clearer sound, real-time two-way speech,easy to deal with various problems.