I tested several (see pics) and all the ones I tried worked. Device and parts are clean. 22 caps total. There are 3 types of numbered caps/buttons. 1-8 of the push in coax type. 1-8 of the phone jack type. 1,2,3,4,6, and 7 of the type with wires and two alligator clips. There are other miscellaneous wires, jacks, adapters, etc. All pictured. The device has instructions on the back and a currently working battery. Any questions or if you need more pictures just ask.
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