1MORE SonoFlow Mini HQ20 Kids' Learning Headphones, Hearing Protection, Three-Level Volume Control, Voice Feedback Function, Bluetooth Over-Ear Headphones, 40mm DLC Driver, Up to 65 Hours Playback, Sound Isolation by Earmuffs, Online Classes, Music, Exam Preparation, 181g Lightweight, Multi-Point Connection, for Kids and Adults (Pink) The 1MORE SonoFlow Mini HQ20 features an over-ear design to enhance concentration during learning and clear real-time audio playback. It supports a wide range of educational uses, from elementary school students to university students, including online classes, exam preparation, and language learning. The three-stage voice feedback function allows you to instantly check what you've said, supporting effective learning by utilizing hearing. 【Safe Three-Level Volume Limiting】Controls the volume in three stages: low volume mode (maximum 75dB), medium volume mode (maximum 85dB), and high volume mode (maximum 94dB). Equipped with hearing protection based on WHO (World Health Organization) recommended standards. The volume mode can be visually confirmed with green, yellow, and red lights, and the volume is automatically adjusted during long-term use. 【Voice Feedback Function】By effectively combining speaking and listening, it stimulates the brain's memory and improves learning efficiency. Three volume levels can be selected to improve memory. *Voice feedback needs to be enabled in the 1MORE app. 【Soundproofing Effect by Earmuffs】 【Delicate and Rich Sound】The 40mm DLC (Diamond-Like Carbon) composite driver delivers clear and delicate sound quality from high to low frequencies. The delicate acoustic design comfortably supports children's learning and music appreciation. It is useful in a wide range of situations, including online learning, music listening, calls, and games. Further customization is possible by utilizing the 1MORE dedicated app. 【Long Playback & Fast Charging】Up to 65 hours of continuous playback reduces the hassle of frequent charging. With 10 minutes of fast charging, you can use it for about 5 hours, allowing you to continue using it without stress even during classes. 【Bluetooth 5.3 & Dual Device Connection】Compliant with Bluetooth 5.3 standards, providing a stable wireless connection. Supports dual devices, allowing you to connect two devices, such as smartphones and tablets, simultaneously.