A roller tube including a body having a tube wall that defines an interior and an exterior. The application is divided into an installation part that establishes proper set up of the application and a protected part which is to be executed in the secure environment. The transmitting stations includes a transmitting antenna with K<SB>B<SB>31 antenna elements, whereby K<SB>B<SB>\u22671, and the receiving stations respectively include a transmitting antenna with K<SB>M<SB> antenna elements, whereby K<SB>M<SB>\u22671, and which communicate via a MIMO-transmission. The housing includes a platform positioned thereover which is masked due to its appearance as providing at least a portion of the housing. The cheap readily available amino alcohol is used as the raw material to synthesize the novel spiro phosphine-oxazoline, on the fourth position of the oxazoline ring of which there is no substitutent.