Clear/Naturel/Simple Hear nature enjoy life. This OTC hearing aid is rechargable when fully charged has a 20 hour working time. the charging case when fully charged will recharge the hearing aid upto 5 times. The volume is adjustable with the included screwdriver. Note: your healthcare professional may prefer to set the volume control to your hearing requirements.

ZF-M610 Digital CIC Mini Hearing Aids Non-Prescription Lightweight Rechargeable design with modern usb-c charger. According to the manufacturer, these are fully charged less than 3 hours and have 20 hours working time. These are over the counter hearing aids, I dont’ see a brand but took a picture of the specifications in the manual. Stored in a smoke-free environment.