RB-M300B Deep Bass Wireless Bluetooth Immersive Headphones with XBS DEEP and Bass Augmentation (Black / Sand Beige) How deep? XBS DEEP. Panasonic's new XBS DEEP (Extra Bass System Deep) technology lets you revel in powerful, well-defined deep bass playback without compromising the depth and balance of the track, letting you feel the clear, dynamic sound with your whole body. Encompassing, Deep Bass With the touch of a button, Bass Enhancer clarifies the bass for an even more powerful sound. Built for comfort Panasonic RB-M300B Headphones feature thick, soft over-the-ear pads with Side Pressure Dispersion Technology so you lose yourself in the powerful, deep bass wherever you go—commuting, working, or traveling. Ready to Go in Minutes No need to wait so long for your headphones to charge−just 15 minutes of charge gives 3 hours of playback. Comfort All Day Long Soft, cushioned headband and earpads fit gently over the ears Charge Once, Listen for Days The RB-M300B holds 50 hours of playback on a full charge, for uninterrupted listening. Even, Smooth Sound Satisfying bass levels without distortion