Item arrived without batteries. Two types of batteries were quoted for use (I know nothing about batteries) but needed support/advice on which to use as NOT so invalidate the warranty! I messaged xmasdirect, NO reply. I researched which batteries to use instead. On trying to use the tester the Christmas bulb area did not work with the bulbs and had to mess with the bulb wires to work with the fuse connector area. This was so fiddly and time consuming, at one stage, I was advised to throw it in the bin!! Not the best example of a time saving tool, so would NOT recommend it. Buy a more expensive and better quality bulb tester, as I will be doing myself!