It automatically turns on 8 seconds after being taken out of the charging case, and automatically turns off and starts charging when returned to the case after use. A gentle green light indicates charging, and turns off when charging is complete. *To prevent howling, please be careful not to cover the microphone with your hands or clothing. You can adjust the volume in 4 steps with a light touch of your fingertip, and you can confirm the operation with a confirmation sound, allowing you to check the number of times the sound plays. With the latest digital noise reduction technology, it suppresses ambient noise while clearly amplifying speech and TV sounds (up to 35dB) - protecting important "sounds" and reducing stress and anxiety caused by "difficulty hearing." Designed for those with mild to moderate hearing loss. 【Please be sure to read before purchasing】 Regarding the characteristics of the sound amplifier, "selective amplification" is not possible, so not only conversational voices but also environmental sounds (vehicle noise/wind noise/everyday sounds, etc.) are amplified. Please use it in a quiet room. This characteristic is a common structural feature of all sound amplifiers. The power-saving design of the sound amplifier allows for up to 20-30 hours of use on a single charge. Furthermore, the included charging case can also charge for up to 100 hours! A total of 130 hours of ultra-long operation completely frees you from the hassle of charging! The remaining charge of the charging case is easily visible with a blue digital display. No need for troublesome battery replacements, making it an economical and eco-friendly design. Sound Amplifier for Elderly, Hearing Amplifier [2025 New Model, Released in July, Fits Small Ears] 4-Step Volume Adjustment, Easy Operation, Voice Amplification Device, 3.2g Lightweight Design, Compact, Type-C Rechargeable, Up to 20-30 Hours Continuous Use, Automatic Power ON/OFF, Remaining Charge Display, 300mah Charging Case, Ergonomic, Fatigue-Free, In-Ear Design, Respect for the Aged Day, Birthday, Japanese Instruction Manual 370- 4000××$900$