The following is quoted from Amazon: 【Smart Automatic ON/OFF Function for Easy Operation】 No complicated operations are required. This hearing aid automatically turns on 8 seconds after being taken out of the charging case and placed in the ear. After use, simply return it to the case, and it will automatically turn off and begin charging. The orange light illuminates during charging and turns off when fully charged. The remaining battery level of the charging case is clearly displayed with green numbers. There's no need to press any troublesome operation buttons, providing a simple and intuitive user experience. *Please be careful not to block the microphone hole during use (to prevent feedback). Manual power ON/OFF is also possible by pressing and holding for 3 seconds. 【One-Touch Volume Adjustment, Amplification up to 35dB】 This hearing aid is designed for easy operation, even for the elderly. You can adjust the volume in 4 levels by simply pressing the volume adjustment button, and you can check the current volume level by the number of beeps. It is recommended to start with the minimum volume. Equipped with a high-sensitivity noise-canceling chip, it reduces noise while amplifying sound up to 35dB, alleviating difficulties in hearing, such as loud TV volumes or conversations with family, and improving the quality of life. Designed for those with mild to moderate hearing loss. 【Amazing Long Battery Life! Peace of Mind Even When Out and About】 The hearing aid can be used continuously for 20-30 hours on a full charge, allowing you to use it all day long with peace of mind. The orange light illuminates during charging and automatically turns off when fully charged, so you can see the charging status at a glance. Furthermore, the included 1200mAh large-capacity charging case provides an additional 200 hours of charging! You don't have to worry about running out of battery when you're out. The remaining battery level of the charging case is immediately visible with a green number display, so you don't have to worry about sudden battery depletion. Comes with a Type-C charging cable! No troublesome battery replacements are needed. 【Only 3.5g! Ultra-Lightweight Design】 Achieves a feather-light weight of only 3.5g. Minimizes the burden on the ears even during long hours of wear. The design has no distinction between left and right, so it can be worn in either ear immediately, with no troublesome adjustments required. The ease of use allows you to simply pick it up and put it on. 【Natural Fit for All-Day Comfort】 This in-ear hearing aid is compact and naturally designed, so it's almost unnoticeable to others, making it easy for first-time users to use without hesitation.