The electrics can either be in the lock or they can be in the keep. It’s a tiny bit more expensive to have the lock version — for example the wire has to be of the right kind and protected in the right way as it will be constantly moving as the door is opened and closed. But the extra expense of an electric release lock is well worth it. It might be 50% more expensive, but it will be at least 300% better.

Electric release keeps tend to be weak and trouble-prone. If the electrics are done correctly, however, an electric release lock — like a Cisa — will go on for decades.