I can only speak about what I got. It was opened, which happens, but inside there were open packages and wires that were not twisted on the wires. It was annoying. I tried it anyway and the audio tone was good with a noticeable difference between filter 1 and filter 2. The advert says it supports DSD but I couldn't find anything to suggest it and it returned. The instructions are useless in this regard. Some things I tried (I returned it the day after receiving it, I found the soundstage wasn't very good, but if I had kept it this could change with 100 hours of recording.
Soft Silicone AirPods 3 Case Cover With Fur Ball Keychain - Shockproof Protective Cover For 2021 Version Charging Case With Visible Front LED - Ideal For Women And Girls - Light Purple By OULUOQI
20 Review
Large Waterproof Cable Organizer Bag For Travel, Universal Electronics Accessory Holder, Portable Gear Carry Case For Cables - Black
28 Review
Universal Electronics Accessories Organizer Bag - Waterproof Portable Cable Travel Gear Carry Bag (L, Black/Pink)
27 Review
Elago AirPods 2 Dust Guard Cover - Gold, US Patent Registered - Compatible With Apple AirPods 2 Wireless Charging Case
27 Review