New in box. Open to check once. Wireless listening, impressive bass Wireless freedom, sleek comfort, and unmistakable bass response add-up to an unforgettable audio experience. Connect via Bluetooth with NFC and let your music loose for up to 20 hours battery life anytime anywhere. 40mm drivers with electronic bass boost will add punch to your favorite tracks. Broad frequency response Large, 40mm driver units deliver broad, dynamic, and balanced sound for an exceptional listening experience. You can enjoy 20 - 20,000 Hz frequency response when streaming audio wirelessly or even broader frequency response, from 3 – 28,000 Hz when using the supplied audio cable. Electronic Bass Boost For impressive low-end bass response, a simple press of the Bass Boost button delivers! A Digital Signal Processor produces club-like enhanced low-frequencies for music that you can feel. Tags: Sony Headphone. MDR-XB950BT.950BT.