During the off-season, motorhomes and caravans are often left unattended on storage sites, making an additional alarm system a consideration. It does not replace mechanical security but signals an attempted break-in. Suitable systems for winter storage have low power consumption, remote notification and operation at low temperatures; the article presents Thitronik WiPro III safe.lock 3, Pironex Sonsor, Antarion Alarm Detect and the Gemini CAN-Bus-Basis-Alarm-Kit.