ELM327 ODB2 scanner casing with reset button

Recently, i bought a cheap OBD2 scanner for my car with bluetooth connection.
It's the cheapest one on ebay right now for about 3.50 USD

search ebay for "ELM327 V2.1 OBD2 Bluetooth Scanner"

With this, your smartphone running the Torque app (or another OBD2 app) you can
view various realtime data from the vehicle, view error codes and reset error states.

I wanted to leave the device plugged in to the car, but because de device is always
supplied with 12V, even if the car is parked, th