An electromagnet 1 consists of a magnetic body 2 that has an integrated coil 3 and has a central hole4 for fixing purposes. The magnetic body locates against a plate 5and on the other side is a plastic body 6 that contains a chamber 8 for the battery cell 9. Activation of the electromagnet supply circuit is made by a switch 10 within the body. The housing is enclosed by a cover 7.
