I have the Ufly with my QC25. I prefer the older ones that use a non rechargeable battery, nothing to wear out or need to tear it apart or replace it when the rechargeable battery eventually craps out. Yes you need to have an extra AAA with you but I get the bulk pack of Alkaline AAAs at Harbor Freight. You get a whole brick of them for $5 when they’re on sale and I get about a month out of a battery or two.