My Motorola HF820 BT adapter (which paired with my Zumo 550 as a "headset" and allowed me to use my cell phone) crapped out on me and is no longer manufactured, of course. While I can probably get another used one from eBay, I'm wondering if anyone else can recommend a BT adapter with a 2.5 mm jack which pairs well with the Zumo. I need the 2.5 mm jack to hardwire connect to my comm system (Baehr). Any advice/recommendations? TIA.