Will these work with the ath-m40x?

No, the shape is too different.

What is the advertised battery life of this product?

It may say 5, or 6 hours, but real world usage (between 75-95% volume) while at the gym using Spotify, I feel LUCKY if I get even 2 hours out of the battery before it dies. I thought I had a faulty unit and have since ordered this product twice and it always ends up the same; at first I can get 2.5-3 hours maximum out of the battery, and after about 4-5 weeks of use I am lucky if I get even 120 minutes of music playback before it’s dead. By the end of 2 months it’s down to about 60 minutes at 90% volume before it shuts off. Yes I’ve tried resetting the battery as if it were an old school unit, and never let it drain entirely for the first 2 months, heck I even tried draining it entirely and doing a batter reset on it and it all makes zero difference. 60-90 minutes of battery on all 3 units after the first month. (Verified purchaser because, like I said, I bought 3 because I didn’t want to believe the product was as crappy as it really was.)

will these work with ATH-M70x ?

They should work on the M70x. They both use a 45mm diaphragm, I assume the housings are the same. I have a pair of M70x's coming, I will update for sure.

Does this require modifying the locking mechanism?

No modifications required. You just plug it, and it stays in its place.

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East Brooklyn Labs Bluetooth Wireless Adapter Amplifier for Audio Technica ATH M50x Professional Studio Headphones

East Brooklyn Labs Bluetooth Wireless Adapter Amplifier for Audio Technica ATH M50x Professional Studio Headphones

Product ID: 35481327

⚡30-Minute Quick Charge

🎧Bluetooth Connectivity

🔋5-Hour Battery Life

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200 Ft

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In stock

Sold byAmazon HungaryDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎶 Elevate Your Audio Game with Wireless Freedom!

RAPID RECHARGE - Get back to listening in just 30 minutes for 5 hours of playtime.
UNMATCHED CLARITY - Enjoy exceptional sound quality with deep bass and clear mids/highs.
CONVENIENT CONTROLS - Easily manage your music with built-in volume and track buttons.
TRANSFORM YOUR SOUND - Turn your wired headphones into a wireless audio experience.
PERFECT COMPATIBILITY - Designed exclusively for Audio-Technica ATH M50x headphones.

The East Brooklyn Labs Bluetooth Wireless Adapter Amplifier transforms your Audio Technica ATH M50x headphones into a wireless powerhouse, delivering exceptional sound quality, convenient controls, and rapid charging for an unparalleled listening experience.

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