To ensure your Grundig 8-in-1 lasts, avoid dropping it on hard surfaces and keep it away from liquids. If buttons become "sticky" or unresponsive, it may be time to clean the contact points under the rubber keypad with a small amount of isopropyl alcohol.
If your device is too new or too old for the built-in database, the Grundig 8-in-1 can "learn" commands directly from your original remote. This requires line-of-sight between the two remotes. grundig universal remote control 8 in 1 manual