As mentioned by most "prescribing", makes the Repeater what he should. The device is already adequately described and telefon-experten.de/garantie there is also the German instructions. The repeater works flawlessly with my Gigaset DX800A. However, in the configuration it had a problem. The pilot tone was not shut down, although I insert the sequence / unplug / etc. einhielt. The red warning light did not flash slowly simple. Eventually I came up with the idea, not plug and unplug the power adapter, but instead directly to the RJ45 connector on the repeater. Then make it work right away. Obviously, the power supply is not able to relieve the stress quickly enough so that the repeater can detect this incorrect. So, for all have also "unexplained" problems: Pull the small end of the lead at the repeater and let the power supply unit into the can insert. But be careful and do not break off the small tab on the RJ45 connector.