It consisted of a simple wooden box with a hinged lid containing a 200-gram (7.1 oz) block of cast TNT and a ZZ-42 type detonator.

Also it is hard to locate the Schü-mine by observation or probing because it is relatively small.

[2] During Operation Overlord, the British resorted to using explosive detection dogs to find them.

[4] In his book A CANLOAN Officer, Rex Fendick, serving with the 2nd Battalion of The Middlesex Regiment during the Normandy campaign, mentions finding what was believed to be a German radio transmitter backpack.

It transpired that the device was actually a Geiger counter used to detect Schü-mines that had been daubed with a patch of radioactive paint.