Experience unparalleled sound quality with the JBL Tune 510BT headphones. These wireless headphones feature the renowned JBL Pure Bass sound, delivering deep and powerful audio for an immersive listening experience. If the headset feels too tight, we suggest placing them over a ball or something of similar size/shape and leaving undisturbed for at least 24 hours. Repeat if necessary, and adjust the length of either earpiece for the perfect fit. Ideal for music lovers seeking fantastic sound and comfort.