bluetooth 5.0 wireless earbuds with 2000mah charging case stereo headphones 90hours continuous playback in ear built in mic headset premium sound with deep bass for sport erligpowht 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].