Abus unworthy accessory

For nearly 3 years, we worser us with these remotes. Have 2 pieces thereof that are both exactly the same bad.
- Lack of range
- Often does not work, although the battery voltage is still well above 2.9V. Poor contacts, as previous reviewers mentioned?
- Very poor quality: Depends only a few keys on blue ABUS-collar, not even in your pocket. Nevertheless, the case are no longer to view.
- Battery cover keeps after frequent opening now barely. But what can you do when the system is armed? Inasmuch as remains found, wait a few seconds, re-insert, wait again and hope it finally comes only battery. If not, the same procedure ... fun at minus temperatures.

My recommendation is clear: Unkaufbar! Sorry ABUS, but take the reviews seriously please. There are your customers!