BPM-2limpet mineThe BPM-2 is probably a product improvement of the BPM mine. It is donut-shaped with 11 magnets mounted on its base. The mine is detonated when its spring-loaded striker is released and impinges on the detonator. The striker is retained by two lead strips, which, because of the spring tension, fail by metal fatigue. Arming occurs after 5 to 20 minutes, and detonation occurs between 5 minutes and 832 hours. It is not known whether this delayed detonation can be determined by the user or is random. An antiremoval device incorporated in the mine will detonate if it is removed more than 10 mm from the target surface.Diameter: 305mm Weight: 6.4kg Explosive: 2.8kg Range: 400m Explosive/filler type: TritonalUnknown