I bought 5 pieces of this safe smoke detector. However, not from Amazon Germany, but for half the price at Amazon UK (link at the bottom of the page here). Was delivered within 2 days via DHL with German tracking number from Staufenberg, Germany. Product is strictly identical, and the battery of the smoke detector frabrikneu holds up 2023rd
With Amazon UK You can put yourself way, log in with your login information German and is payable by credit card.
Update 17.04.2013: After nearly 4 months use of the first smoke detector has triggered ever. Namely in consequence of no Küchenmaleurs with severe smoke development. So still thumbs up!