and modern . 3 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 charge design looks like earphones: Feel confident while boosting your hearing. Unlike other aids, these look and feel . Comfortable inner-ear buds in 3 versatile sizes: These effective sound enhancers have a modern slanted design so they're snug and . Try the different earplug sizes to find your . 1 easy-to-use button to change : Use the simple mechanism to switch and adjust the volume input. Practical -USB charging for 10 hours' use: The 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 supports are powering up and when they're to use. Enhance your abilities with an average gain of 25dB5dB: 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. is fully , it will change to white. The hearing aids: Carefully place 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. 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 ton for 3 seconds to turn the hearing aid off again. Maximum OSPL90: less than 117dB3dB High frequency average OSPL90: 109dB4dB Average gain: 25dB5dB Frequency response range: 400Hz-4500Hz Equivalent input noise sound level: less than 29dB+3 harmonic distortion: less than 7% Related power supply: less than 6mA Colour:White Material:ABS Package Contents: 1 Pair x ear hearing aid Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.