The Bass Gets Bigger With MDR-XB70BT The New Addition To Sony S Extra Bass Lineup. Worn Behind The Neck, This Bluetooth Wireless Headset Is Perfectly Balanced, So You Hardly Know It's There. You Can Enjoy High-quality Audio, And Clear, Natural-sounding Voices On Both Ends Of The Call. Pair It With Your Smartphone Instantly When You Make A One-touch Connection Via NFC.