Plug, 8 prong for Models 1100-1650 speaker or for converting 1015, 1080 & 1100 models to free play. For freeplay 1100 and 1400 jump pin 1 to 3 and 5 to 7, for 1015 jump pins 1 to 8 and 5 to 6. Note color of plug may vary. Cap sold separately.