One Step Pairing Technology. </b> <p> <b>First Time use: </b> <p>-1.Take out both headphones from the charging box, they will be automatically powered on and interconect. <p>-2.Turn on the Bluetooth of your phone or other Bluetooth devices. <p>-3.Click "D2" in your device, then enjoy your music time! <p> <b>Second Time use: </b> <p>The headphone will automatically connect the last paired Bluetooth device, no need of pairing again. <p> <b>2000mAh of Charging Case</b> <p> Built in 2000 mAh larger capacity, could recharge the earbuds 18+ times, means they get up to 90+ working continuous hours. <p> <b>Sweat-poof</b> <p> <p>Working properly for workouts in the sun or for songs in the rain. Perfect for exercises. <p> <b>One Button Control Technology </b> <p> <p>Play/Pause :Press key one time to switch play/pause music <p>Previous song:Double click (L) <p>Next song :Double click (R) <p>Volume control :press (R) 3 times in row to increase volume; press (L) 3 times in row to decrease volume <p>Call mode: short press one time to answer a call, long press 2S to reject; <p>Call/Dial：short press to end the call during calling, short press to cancel dialing when dialing a call. <p>Voice Assistant: Long press (R) or (L) ,ear-bud voice prompt “DU”, the voice control is started. <p> <b>Multi-Mode</b> <p> <p>Mono Mode: use the left or right side separately to connect different devices. <p> Stereo Mode: Ideal for driving or not wanting to miss the sound around you. <p>Share Mode: Give one earbud to your lover/familiar/friend to share your moment. <p> <b>Notice</b> <p> <p>1.Please keep the Bluetooth range within 10 meters. It may be stuck and disconnected when out of the distance range,. <p>2.If the phone claims"Connection unsuccessful", please delete all [D2]records on your phone,then click to research and select[D2].