As the name implies, a dash cam is mounted on the dash of your car and records the road ahead of you. It produces video with a 720p resolution. The camera shoots video at 30fps.
From Amazon
Garmin BC50 Wireless Rear View Back up Camera, 160-degree Field of View, Long Transmission Range ideal for longer vehicles, IP67 Waterproof, Professional Installation Recommended
HDEW Cameras
Garmin BC 50 Wireless Backup Camera