Ultimate Comfort and Secure Fit: The Open-ear ergonomic and lightweight design provides you with a secure fit and maximum comfort. Twist the rotatable ear hooks with multiple-sized earbud tips to find the suitable spot for your ear, feel nothing on your ear, and enjoy your all-day listening. Incredible Audio Quality: Equipped with dual 16.2mm drivers, DOSS open-ear headphones provide precision-tuned sound. The built-in high-performance microphones maximize the call clarity, pick up your voice, and make it be heard clearly during phone calls. Ultra Clear Calls: Four high-performance mics provide more reliable signal transmission, pick up your voice crisply in real time and are heard clearly. Up to 33 Hours of Playtime: Get 11 hours of music from a single charge of the workout earbuds and power an additional 22 hours playback with the charging case( about an extra 2 full recharges). Meet all your needs throughout the day at work or trip without interruption. Seamless Music: Advanced Bluetooth 5.3 technology provides a more stable and faster connection with less lag. Easier pairing and automatic connection to your last device. DOSS Open Ear Headphones with Superior Sound, Clear Calls, 30 HS Playtime, Ultra-Lightweight Design with Rotatable Ear Hooks, Maximized Comfort, and Secure Fit, Bluetooth 5.3 Headphones for Workout.