Sennheiser's HD1 Free liberates your listening experience. Cutting edge wireless connectivity combined with a luxurious, ergonomic design offers all day listening enjoyment. High quality dynamic transducers deliver signature Sennheiser sound featuring powerful bass response and detailed vocals in an impressive sound stage. When not being used, magnetic elements in the earpieces allow them to link together to be worn stylishly around the neck. Bluetooth 4.2, AAC codec and Qualcomm apt-X Low Latency support ensure crystal clear wireless transmission, so you can experience the critically acclaimed HD1 sound cable free in an ultra compact ear canal headphone. Exceptional low latency audio performance ensures brilliant synchronization of audio and video enhancing TV, movie and gaming performance. Use with mobile devices is effortless, thanks to an integrated three-button remote and microphone for controlling phone calls and music. Multi-connection is supported with up to 2 devices at once. Further convenience is ensured by intuitive voice prompts. The six-hour battery can be charged via the supplied USB cable. A luxurious leather is supplied for storage with not in use. Like all HD1 headphones, HD1 Free is crafted from premium materials delivering superior comfort, timeless style and lasting durability.