Aye good them MDK, might be an idea to update to new batteries mind, found that mine had been inside the padlock a fair while, and were starting to corrode, can buy cheap battery packs off your local market stall, AG013 iirc.
myself and my paps bought one and both had the same problem the key barrle fell out makeing it compley bloody useless a complete wast of money but did work for the month or so i had it
