👉Description: 【Easy To Use】We simplify operations for seniors, no more fiddling with complicated buttons. Each pair comes with 3 types/3 sizes of ear domes, Choosing the appropriate ear domes and wearing them properly can prevent sound leakage and effectively avoid whistling. 【Invisible Design】Similar skin color designs can hide the personal sound amplifier to the greatest extent. The size is only just 0.85x0.73 inches, very small and lightweight. No burden for ears of long times using. Great for people wearing glasses or masks. 【Upgraded Recharging】Adofi personal sound amplifier can be used for both left and right ears, so you will never be confused about which is the left or right sound amplifier. Our advanced charging technology enables 2-3 hours of full charging time and 35 hours of continuous working duration. 【Ideal Gift】The newly designed amplifier has clear sound amplification. It is beautifully packaged and is the perfect gift for family and friends. 【Unlimited Support】Your shopping experience is the highest priority for us! If you have any questions, you are welcome to contact us at any time, we will provide you with high-quality service and sincerely solve the problem for you. 👉Product Advantages: Dual noise reduction Whistle suppression Imported "core" piece Long life span Comfortable to wear One button operation 👉Specifications: Color: White Full Range Gain: 23±5 dB Charging Time: 3 Hours Battery Capacity: 220 mAh Working Hours: 35-48 Hours High Frequency Average: 103±4 dB Total Harmonic Distortion: ≦ 10% Maximum OSPL 90: 120 dB+3 dB Equivalent Input Noise Level: ≦ 35 dB Frequency Response Range: 300-3500 Hz