These adapters are available for the m50x as well: https://www.amazon.com/Bluetooth-Adapter-and-Amplifier-BAL-M50X/dp/B01MFFH54C/ref=sr_1_3?ie=UTF8&qid=1542252784&sr=8-3&keywords=m50x+bluetooth+adapter
Advertised battery life of 6 hours however reviews indicate it is poor, along with some...