[CIS-A MUST HAVE FOR YOUR LOVER-This hearing aid is a small electronic device that you wear in your ear. It makes some sounds louder so that a person with hearing loss can listen communicate and participate more fully in daily activities. Suitable for seniors and adults CIS-NOISE CANCELLING HEARING AIDS- Our in-the-ear hearing aids adopt the latest German chip and enhanced atom series sound processor zero whistling CIS-A COMFORTABLE DESIGN FOR EVERYDAY HEARING- Their small stature not only means that they practically dissapear it also means they are very light weight and are comfortable to wear all day long unlike many other in-ear units CIS-NO MORE SPARE BATTERY-The hearing amplifiers come with a charging case (like many earbuds) that can charge the devices when away from a power source and plugs into the wall to recharge the case. The charging case can store 60 hours of standby power which is enough to charge the hearing aids 5-6 times. Each charge supports 13-16 hours of continuous working time for the device CIS-EASY OF USE- Simply long press the button to turn onjust fingerprint touch when change volumeno need to press button or adjust by tool. which is simple and clear and very suitable for the seniors]