It seems to turn off when the car turns off so nothing so far. I used the passenger usb and 12v. The 12v has a cover that flips up which allows you to keep it horizontal so the the light shines down . Slim 12v https://www.amazon.ca/Charger-Output-iPhone-Samsung-Galaxy/dp/B00MA8JZ10/ref=mp_s_a_1_fkmr2_2?ie=UTF8&qid=1539943406&sr=8-2-fkmr2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=aukey+slim+12v Bought a couple of these https://www.amazon.ca/MOTONG-4pcs-Package-Interior-Atmosphere/dp/B0799KB1DL/ref=mp_s_a_1_1?ie=UTF8&qid=1539943757&sr=8-1&pi=AC_SX236_SY340_FMwebp_QL65&keywords=MOTONG+4pcs+Package+USB&dpPl=1&dpID=41GYSgvqfTL&ref=plSrch
Yes it's on when the car is on just like ambient lighting . One thing I noticed is the usb is powered during pre conditioning and the 12v is not