Marshall Mid Bluetooth Headphones On-Ear Black Bluetooth aptX : Bluetooth v4.0 aptX technology that provide a 10m operating range for improved connectivity. Wireless Phone Functionality : Two built-in passive noise reduction microphones allow you to have conversations and record voice memos through your device. Wireless Playtime: Up to 30+ hours of wireless playtime on a single charge Custom drivers for a superior sound : Custom 40 mm dynamic drivers provide clear sound Rock ‘n’ roll soul with modern design and features : complete with black leather vinyl, signature Marshall script, solid metal hinges and brass details.