I installed this on
Toyota Prius

Review
This backup power unit is easy to install with all necessary cables, plug and wires for installation. In a day I drive more than 2.5hrs and using it during parking mode will easily able to record for another 7~9hrs (depends on charging time) The unit comes with a reverse charging feature that looks interesting but I tried to turn it on but doesn't seem to be working though. Everytime we turn on there will be a sound from the unit

What I like
Comes complete with cable, cigarette light plug/socket and all installation stuff (Velcro).

What I do not like
The starting up sound is annoying.
Pricing wise is on the high side.