The W04 is designed as an in-car rear camera that can be installed easily without technical supports. This model is an optional rear camera for W02 and the rear combo camera for W01.The W04 in-car rear camera is equipped with a SONY sensor, with higher light and exposure sensitivity, it captures clear imaging and recordings and will store them instantly to the front camera memory card. The recordings can be accessed from the front camera through Wi-Fi connection on your phone, without limitation from satellite signals.The W04 in-car rear camera has a compact design that reduces interference of driving rear view, as well as the risks of burglary while you are away.