The splitter works great and the USB charging ports are very handy. My favorite is the car battery gauge! I noticed my battery voltage dropping after the car wasn't used for a few days. The voltage showed about 11.4 volts. After driving for a while I was able to turn it off and it went back up to 12.4 or 12.5v. After a day of inactivity, it fell back to mid-eleven. The battery was running out and this device saved me from possibly getting stuck somewhere. Great device!