The plus in security Protect yourself effectively against burglary with this set. If an intrusion is detected via the opening detector or the multi-sensor, you will be alerted via the indoor siren and by message to mobile devices - this provides more security when you are present or absent. With the components included in the set, you form a basis for modern burglary protection, which you can expand step by step with other Z-Wave products from ABUS and other manufacturers.