This card fits inside the CDTV and gives it two standard Amiga compatible mouse / joystick ports, The ports are on to a black plate that replaces the expansion port plate at the rear of the CDTV which makes it hard to fit if you have an SCSI interface already fitted.
The card is German and was probably only sold in Germany (I have never seen it for sale in the UK where the Brick-ette was the popular option)
Similar units sold for approximately £50 in the UK in 1993.
When you are using a mouse or joystick connected to the interface the IR interface can not be used as the CDTV (Like all Amiga`s) can only have two mouse / joystick ports.