The Blackvue 550 in car accident witness camera system includes a full HD 1920x1080P forward facing camera and a HD rear facing camera too, this gives you great coverage in the event of an accident either ahead or at the rear of your vehicle.The forward facing camera features a quality Sony Exmoor sensor chip for excellent clarity video footage even in low light situations.The Blackvue 550 system offers 30fps real time video footage for smooth playback of recorded footage and utilises a 137 degree wide angle lens.A coaxial cable is supplied for the linking of the front and rear cameras.A 16G micro SD card is supplied but the system can accept up to 32G if you wish to increase the recording capacity.The Wi-Fi facility means that you never have to remove the micro SD card if you choose not to. You can simply view recorded or live footage on your Android, iPhone or tablet. The Wi-Fi live view can be handy for positioning of the cameras to cover your preferred area.The MyWay Viewer software supplied is compatible with a PC or Mac and allows you to see exactly what happened, where it took place and how fast you were travelling at the time. This is due to the built in GPS & G-sensor modules. The software also allows you to access and alter the system setup with options for: resolution, fps, time zone, brightness adjustment, g-sensor sensitivity etc.The PIP (picture in picture) facility allows you watch recorded footage from both the front and rear camera on the same screen. Front and rear camera footage is recorded in separate files for easy management of the recordings.The Blackvue 550 also records audio but you can switch off sound recording if you wish to.