The CanDo OBD Aid is an OBDII port break out box that offers access to every pin of the DLC and also reports system voltage through a digital readout and will also provide an audible warning if the voltage levels travel outside of safe levels. The OBD Aid also has LED's to help identify communication protocols and activity.
After researching OBD-II DLC BOB's for many weeks, I decided the CanDo OBD Aid, with features not available on other units, was the best bang for the buck. I have been using this BOB for about a year now, and have been very happy with it. I would not hesitate to recommend this to others.