• 3-in-1 Headphones: Use them as sleep headphones, sleep mask, and sports headband. • Comfortable and washable material: Made of a soft, cool, and breathable material that absorbs sweat and dries quickly. • Bluetooth 5.0 technology: Built-in stereo speakers and microphone for high-quality digital sound. • Long-lasting battery: Up to 10 hours of playback with a 2 to 2.5-hour charge. • Easy to use: Integrated volume control, song switching, and call functions. • Product dimensions: 24 cm long, 7 cm wide, and 1.5 cm high.