Concerning this item Extended Playtime: The Soundcore K20i's charging case allows you to listen to music for up to 36 hours. You can enjoy two hours of playback with a quick 10-minute charge, so you're always prepared to immerse yourself in sound, wherever you are and at any time. Clear Sound: The Soundcore K20i earbuds are perfect for podcasts because of their 13mm dynamic driver, creative torus design, and BassUp technology. Semi-In-Ear Comfort: These Bluetooth wireless earbuds are designed to fit snugly in your ears without the need for ear tips, and their lightweight, comfortable design allows them to stay in place all day. They weigh only 3.3g. Clear Call Quality: The AI-powered noise reduction technology in the Soundcore K20i earbuds precisely separates your voice from background noise. Maintain pristine conditions with dual-mic ENC.