People, be aware that this product is a short lasting product - 6 months. Without warning it dies on you. Firstly the power adaptor goes and then it takes the unit out. But the best thing is, Yale customer support, send you a pre-paid label for you to return the product. That's the last time you will ever see it. 6 months later after numerous queries, they finally respond through an apologetic customer support manager, who asks for your address and he will dispatch replacements immediately. 2 months later - no product. So after writing to all concerned, the very same person responds with the same earlier mail, again asking for your address.
Be careful in buying this piece of junk!