Behind-The-Ear Hearing Aids With Charging Case Smart Noise Cancelling & No Feedback Whistling 1. Intelligent Noise Reduction & Wind Resistance Technology: Effectively reduces environmental noise and wind interference, enhances voice clarity, and restores natural sound quality. 2. Magnetic Charging Case with 144-Hour Ultra-Long Endurance: The case provides 3 full charges (48 hours per charge), totaling 144 hours of usage. Magnetic design allows charging without removing earpieces—charge instantly when placed. 3. Suitable for all-day wear, ideal for outdoor activities or home use. 4. Sliding Wheel Volume Control + One-Click Mode Switching: Physical button design enables easy volume adjustment or mode switching for elderly users, eliminating complex operations. 5. Soft ear tips conform to ear contours, ensuring secure fit during exercise and comfortable long-term wear. 6. Overcharge Protection & Lightweight Body: Built-in charging protection system; behind-the-ear design minimizes ear fatigue. Parameters: 1. Max OSPL90: 110+-4dB 2. High-Frequency Average OSPL90: 108+-4dB 3. Full Volume Gain: 41+-2dB 4. Average Gain: 28+-2dB 5. Equivalent Input Noise: 30+-2dB 6. Frequency Range: F1 less than or equal to 350Hz, F2 less than or equal to 5000Hz 7. Distortion: Less than or equal to 5% -Lab test data is for reference only; actual products may vary.