Useful little module, but documentation particularly poor/non-existent, so beware! The main thing missing was the Bluetooth ID code for the unit. It turned out (through trying different combinations!) to be "1234", which is often the default but didn't appear to work the first few times I tried it. Have yet to use the PC software, as I ended up just using the freeware version of Torque for Android on my mobile. Other than the documentation issue, build quality seems good, and once connected it stayed that way for most of the session, with one or two short drop-outs of connection. So, overall...good! To save you hassles: 1. Plug the unit into your car's OBD slot and ensure it has power (red LED will light). 2. Initiate bluetooth, entering "1234" when the PC/phone asks for the BT ID. Check that the LEDs on the module then flash in a sequence. You should now be connected, and can use Torque or any other OBD application (several freeware PC versions on the included mini-CD).