Scienlodic Rechargeable Hearing Aids Sound Amplifier Invisible Hearing Aid Ear Hearing Amplifier Aid Mini Hearing Aid for DeafElderly

Specification Maximum Saturation Sound Pressure: 129dB 4dB Sound Gain: ?38dB Frequency Range: 450-3000Hz Equivalent Input Noise: ? 30dB Total harmonic wave distortion: ?10% Charger current and voltage: INPUT: 100-240VAC-50 / 60Hz, OUTPUT: 0.8mA, 1.5V Package Including 1 x Hearing Aid 1 x Storage case 1 x Charger (110-240v.) 4 x Earplugs 1 x User Instructional Brochure Note Charging:4hours (First time should be charged 8 Hours) Working about 24 hours Remove the battery if you don't use it for long time. Kindly Remind 1.Adjust volume to the minimum before wearing. 2.Choose an earplug of slightly bigger size to avoid whistler. 3.Increase volume gradually to avoid sudden increase in sound. 4.If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight. 5. Please use the matching charger to charge the product, otherwise it may damage the product. 6. If you need to use a replacement charger, please use a charger suitable for the product. If an inappropriate charger is used to charge the product, it will cause damage to the product.