I will keep it simple! The screw holding the battery cover in place just span in the hole and required 2 precision screwdrivers & (3) hands to even remove the battery cover! Then when the batteries were installed the thing was dead, no red LED power Indicator and no sound. Its not a big deal as it was only 5 quid, but I just thought I should share the info, maybe mine was just a bad one who knows?