TWS BT earphone is specially designed for you to listen to music and answer calls while doing sports or driving, which features advanced True Wireless (TWS) BT Technology, built-in high-grade microphone and speaker, hands-free function and lightweight design. Bring more convenience to your daily life, office time, driving or travel. Features:Charging Box:The 350mAh charging box can provide full power to the earphones for 2-3 hours when it's fully charged, it can also be a perfect storage case for earphones, protecting them from damages.TWS BT Design:Wireless dual ear stereo design, left and right ear channel separation. You can use the Left and Right ear earphone solely (single track mode), or use them in pairs (stereo mode).Noise Reduction HD Call:Built-in high-sensitivity microphone reduces ambient noises and grasps the detail of voice, ideal for in-car calling or working use.Advanced BT Technology:True wireless (TWS) BT technology ensures seamless connection with all BT enabled devices up to 24meter without interruption.Button Control:Easy to use with a slight press on the button, will bring more convenience to your daily life, office time, driving or travel.Good Compatibility:It can be compatible with most smart phones on the market, you can have a try without worry.Specifications:Model Number: H17TBT Version: 5.0Transmission Distance: 10m (no obstacle)Horn Frequenncy Response: 20Hz-20KHzSpeaker Sensitivity: 95dB / 1KHzBattery: Earphone: 2 * 3.7V / 40mAh; Charging Box: 3.7V / 350mAhMusic Playing Time: about 2-3 hoursCharging Time: about 1-2 hoursStand By Time: about 40 hoursColor: Black, White (Optional)Item Size: Approx. 5.7 * 4.7 * 2.6cm / 2.24 * 1.85 * 1.02inItem Weight: Approx. 37g / 1.31ozPackage Size: Approx. 9.8 * 9.8 * 3.5cm / 3.86 * 3.86 * 1.38inPackage Weight: Approx. 106g / 3.74ozPackage List:1 * Pair of Earphones1 * Charging Box1 * Micro USB Charging Cable1 * English User Manual