Ergonomic Comfort Fit Perfectly fits the curve of inner contour of ear. Keep your earbuds secure stay and much comfortable in your ears. Accurate sound tube angle perfectly fits your ear canal, and seal block out external noise. Provides a pure immersive sound. Imaginative Transparency to Create Crystal Buds Distinctive Transparent Crystal Elements Conceal Internal Components in A Minimalist Style while Sustaining The Semi-transparent Effect, Clear and Bright. Ultra-thin Layer Fully Demonstrates the Perfect Combination of Nature and The Beauty of Curves, Producing Sleek and Lightweight Stylish. IPX8 Waterproof and Sweat Proof Effortlessly Protects the Earbuds from Heavy Rain or Sweat during Intense Workouts and All-weather Conditions Crystal-Clear Call TOZO Crystal Buds are equipped with 4 microphones to reduce ambient noise through Dual-microphone AI algorithm, so you can enjoy High-fidelity audio and Crystal-clear call even in noisy environments.