BDN6729A: This BDN6729A is Our Replacement for the Motorola Original 2 Wire System. With our Replacement you do not need to buy the connecting adapter to the radio, Ours comes Standard. Our unit is also Kevlar Coated wiring, Acoustical tube to the ear for comfort and comes with a 3 year warranty. Compatible Radio Models: XTS1500, XTS2500, XTS3000, XTS3500, XTS5000