Stylish and modern . 3 handy earplug sizes for customized comfort. Just 1 button to adjust sound input. Fast USB charging with long battery life. Portable case with lights to indicate chargedesign looks like popular earphones: Feel confident while boosting your hearing. Unlike other aids, these look and feel stylish.Comfortable inner-ear buds in 3 versatile sizes: These effective sound enhancers have a modern slanted design so they're snug and secure. Try the different earplug sizes to find your perfect fit.1 easy-to-use button to change settings: Use the simple mechanism to switch on and off and adjust the volume input.Practical micro-USB charging for 10 hours' use: box gains full power in just 2 hours, and your hearing aids take just 1.5 hours to fully charge.The practical 1.6x2.3x1.1in/4.1x5.8x2.8cm container shows you: when your listening supports are powering up and when they're ready to use. Enhance your listening abilities with an average gain of 25dB±5dB: Take in more of the sounds of your family or the natural world with a frequency response range of 400-4500Hz..Charging instructions:The case: Take the included charging cable and plug it into the port. When charging, the case will show a blue indicator light. Once is fully , it will change to white.The hearing aids: Carefully place them into the charging box. A blue light will be displayed while charging and a white light when they are fully .How to wear the hearing aids correctly:1. Choose the most comfortable size of earplug.2. Place the earplugs onto the hearing aids.3. Hold the button for 3 seconds to turn it on.4. Press the button briefly to adjust the volume input.5. Place the hearing aid into the ear until it is snug and comfortable.6. Press and hold the button for 3 seconds to turn the hearing aid off again.Maximum OSPL90: less than equal 117dB±3dBHigh frequency average OSPL90: 109dB±4dBAverage gain: 25dB±5dBFrequency response range: 400Hz-4500HzEquivalent input noise sound level: less than equal 29dB+3Total harmonic distortion: less than equal 7%Related power supply: less than equal 6mAColour:WhiteMaterial:ABSPackage Contents:1 Pair x ear hearing aidOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.