bluetooth earbuds,kingto mini wireless stereo headphones invisible car bluetooth earpieces earphones headset with mic & magnetic charge box for iphones android phones (black) king to <strong>specification:</strong><br> bluetooth version: v5.0+edr<br> wireless frequency: 2.4ghz<br> supporting agreement: a2dp1.3/hfp1.6/hsp1.2/avrcp1.6/d11.3<br> transmission distance: 15-20 meters<br> battery capacity: 45mah/350mah<br> charging voltage / current: 5v / 1a<br> play / talk time: about 3 hours<br> charging time: about 1 hour<br> standby time: 60 hours<br> speaker impedance: ?10mm 32?<br> microphone sensitivity: -42db<br> working temperature: -10-50 °c<br> <strong><br> feartures:</strong><br> bluetooth 5.0, energy saving, improved data transmission, and low interference,built-in microphone, with excellent cvc8.0 noise reduction, makes data transmission more timely, stable, faster and farther, provides 3d stereo effect to improve your listening experience.<br> one step pairing,just pick up the headsets from the charging box, they will connect each other automatically and and there's no need for re-pairing after initial pairing, even if the phone is out of sight, you won't miss an important call.<br> wireless dual ear stereo design, left and right ear channel separation; you can use its left and right ear headset solely (single track mode), and it also can be used in pairs (stereo mode).<br> the headphones will be charged automatically in the charging box and stop automatically after fully charged,3300mah charging box can work as a power bank to charge your smart phone, mp3, etc.<br> living waterproof,perfect for sports,running,jogging & gym exercise or more.<br> <br> <strong>package includes:</strong><br> 1* tws earphones<br> 1*charge case<br> 1*usb charging cable<br> 1*user manual