The PRB 408
is a Belgian
square shaped anti-tank mine
which consist of a polyethylene
case with a handle in one side and a cylinder in the top of the box. The mine contains a high explosive charge, a pressure-initiated fuze, a pressure plate and seven fuze wells but no power source. The mine is detonated when the pressure plate collapses by the action of a vehicle.
There is a variant, the PRB M3409, which has waterproof capabilities can be placed in shallow waters, it is probably the predecessor to the PRB M3 antitank mine.