Mini Invisible Elderly Hearing Aids with Digital Display Charging Case Portable Sound Amplifier with Digital Display for Elderly Hearing Impaired People Magnetic Charging Features: 1.Imported high-performance chips provide you with high-definition sound quality and intelligent noise reduction, allowing you to listen easily and communicate without obstacles. 2.Five-level volume control, with buzzer prompts, to meet the actual needs of different groups of people. 3.Stylish earbud shape, compact and lightweight body, fit the ear tightly, comfortable and stre-free to wear. 4.One-button operation, simple and convenient, very suitable for the elderly and hearing-impaired people who are not good at complex operations. 5.Mini Portable Charging Box: Magnetic charging design, can be charged anytime and anywhere; with power display, so that the charging time is clear at a glance. 6.3-4 hours charging time, 36-90 hours long battery life, meet the needs of daily use and avoid frequent charging. Specifications: Material: ABS Color: black Size: 7.5*4.5*2.8cm Weight: 46g Packing size: 9.7*9.7*4.6cm Maximum output: 115+3 High frequency average SSPL90: 110db4db Full peak gain: 255db High frequency average gain: 34dB Frequency range: F14700HZ Total harmonic distortion: 500Hz7%, 800Hz7%, 1600Hz7% Equivalent input noise level: 24db Quick charge: 3-4 hours Battery life: 12 hours Battery type: rechargeable lithium battery Packing List: 2* Hosts 1* charging case 4* Earplugs (2 are already on the main unit) 1* brush 1* USB Charging Cable 1* English User Manual