It makes little sense to install several smoke detectors in a bigger house, you might not hear in an emergency. Subsequent cabling is also not always easy. The Security Center RM0011 VdS Wireless Smoke Detector I finally found a workable solution. If the battery lasts really 10 years the money is well spent. Have the equipment now four weeks running. The connection over two floors is okay, false alarms not previously. Will probably be further upgraded.
