Recommendations please for neutral sound profile wireless earbud in ear bluetooth headphones. Priorities in descending order: 1. Sound quality - must be neutral (essential) 2. Portability - must be truly wireless and if not in use, stored in recharging case in jacket pocket (essential) 3. Noise isolation/cancellation - either passive via deep fit into ear canal with snug fit eartips (I use small-medium ear tips) or active noise cancelling, as shall be using on flights, trains and metro (tube) commute 4. Battery life - absolute minimum 2 hours’ battery life from per charge, 4+ hours’ preferred 5. Price - no fixed budget Not desired, but prepared to consider: Models requiring custom ear molds, providing those ear molds can be obtained in Europe. Not interested in: Over ear, on ear, wireless with neck band models; anything with a bass-enhanced or otherwise non-neutral sound profile. The closest bluetooth earbuds I have found so far: Trinity Phantom Air v2 with neutral filters (I received v1 and v2 from the Kickstarter campaign). My current wired headphones: Etymotic ER-4SR (current model) Previous headphones: Etymotic ER-4P (bought 2003). What are you recommendations (and advice for what to avoid)? Thank you in advance for your help.