Marshall Minor IV are equipped with 12 mm dynamic drivers, which cope with their task better than expected even in the presence of interference at 32 ohms. Wireless audio transmission is provided by Bluetooth version 5.3. with a range of 10 m and support for the LE standard. The frequency range declared by the manufacturer is from 20 Hz to 20 kHz. As for playback time, the headphones themselves boast 7 hours of operation, to which the case adds another 23 hours, while the headphones reach full capacity in just over an hour, and the case takes about twice as long. Marshall promises 15 hours of listening to music with just 3 minutes of charging. Thanks to the IPX4 splash protection class, you don’t have to worry if you get caught in the shower or someone is naughty by the pool.