OPEN-BACK DESIGN FOR COMFORT AND SAFETY - Lightweight wraparound frame and wireless open-ear cups provide a snug fit around the earbones, reducing ear fatigue and pain during extended listening sessions. This design also allows you to maintain awareness of your surroundings for a safer outdoor experience while enjoying your music. PREMIUM SOUND EXPERIENCE - Utilizing bone conduction technology, sound is transmitted directly to your inner ear via cheekbones, bypassing the eardrum for a high-quality 360 stereo surround audio experience, with emphasis on bass. Advanced sound leakage elimination technology suppresses sound leakage, filters ambient noise, and enhances clarity of human voices. IPX8 WATERPROOF & SWIM-READY - These earphones are professionally designed to be IPX8 waterproof, sweatproof, dustproof, and moistureproof. Tested to withstand depths of up to 99 feet underwater, they're perfect for swimming and worry-free use during rainy workouts. Enjoy a secure fit that keeps the earphones in place, boosting motivation and enhancing your workout experience. EQUIPPED WITH DIGITAL DISPLAY - Equipped with an LED digital display screen, after turning on, it will display the remaining power and listening mode (Bluetooth mode or MP3 mode), which is more clear at a glance. It comes with a 32GB memory card that can store 10,000+ songs, allowing you to enjoy music even without a mobile phone. The latest Bluetooth 5.4 chip can improve performance, stable and fast connection and enhanced sound quality.