This gadget uses a 1.3 CMOS image sensor to record footage in case of an accident. The highest memory card it can hold is an SD 2GB, but that is good for up to 18 hours of footage, more than enough when you consider that you probably won't be driving for all 18 hours, and the gadget is programmable to record at 2-3 second or 3 minute intervals. You power the device with two AAA batteries, or by a standard DC 12V charger.