Alpine Over-Ear Headphones - Apollo White New Alpine SV-H300UB Over the ear headphones - White iPhone- and iPad-compatible audio cable TKR3 Full Frequency Immersion Technology: Unique sound field expansion simulates the experience of listening to live music KR3 Technology addresses the fundamental issue with speaker drivers. Typical standard headphone drivers simply cannot move enough air to create an immersive low frequency experience without damaging your ears. TKR3 utilizes the headband structure to transmit acoustic low frequency to blend with our tuned 40mm drives. Fixed, rechargeable Li-ion battery with 10-hour capacity