I bought these adapters to work with the Cmple - Triple IR Emitter Mini Stick-On Infrared Emitters and a Harmony Smart Hub remote system. The emitter plugs are 2.5mm while the Harmony Hub needs a 3.5mm connector. The adapters are small, both ends fit perfectly with the two products, and they're actually stylish to boot. What's not to like?Bought a 5 pack of these and all 5 adapters have problems. All of the adapters will cause the audio to cut out if you move it in any way, such turning your head. While some of the adapters were also slightly bent. The bent ones appear to be manufacturing issues and not a shipping problem. I'd recommend looking for a different adapter, I took the chance on these hoping at least 1 would be worth using and found none worth the effort.They fit great on my Sennheisers, but they get staticky after a few weeks of regular useI've seen some reviews saying that these are low quality but at least the ones I have received are rock-solid and I have no issues. I am using them to add V-Moda BoomPro to my Audio-Technica ATH-M50 headphones.Fine productDid not work with my walkie talkies.