With the 3rd Eye MR420S DVR, capturing and retaining vehicle mishaps is both easy and cost-effective. The unit mounts inside the cab and easily hooks up to both power and your camera source [optional] via included cables. In addition, with the included 32 GB Commercial-Grade Card, you can record and retrieve audio/video immediately – and the unit will accept up to an optional 128MB Card for added recording capacity. Contact your 3rd Eye Sales Representative for more information.