The full name of this device is "Übertragungsladung 37 für Minen zu Demonstrationszwecken".
It is a small additional booster which goes in place of the normal fuze. This booster is fitted when mines are being detonated as a demonstration. In the centre hole there is place to fit a No.8 detonator, electric or non-electric. The red paper charge holds 30gram TNT.