Save 15% when you purchase this combination pack.  If you were to buy the Choker, Jr and the Insert separately, they would cost you right at $20.00.  We offer this two-pack along with a lead wire that has a female snap and a TENS pin to connect it all.  The power box connection is a 2.5mm audio jack and will fit the Coyote and several other units.  If you have a 3.5mm connection at the power box, just purchase a 3.5mm male to 2.5mm female adapter located in our Wiring and Adapter section and your good to go!!