【 APP CONTROL】: Our APP not only volumes control, but also personalized setting base on individual listening experience. Hearing aids for smartphone, the APP "Widersonic" is available for both IOS and Android. 【4 SOUND PROGRAMS & VOLUMES ADJUST】: This bluetooth hearing aids is Automatically filter noise in 4 different environments, only amplify the speech volumes. Bluetooth connect to the smart phone then switch programs and adjust volumes, and when you find a device you like, the hearing aid will remember your selection. 【SUPER EFFECTIVE HEARING ASSIST AMPLIFIER】 -Able to enhance talking and local sounds while diminishing howling volume intensity these hearing amplifier let you set the right volume to fit your space, company, work environment, and more. Ideal for most mild to moderate hearing loss. 【Small & Comfortable】The hearing amplifier conforms to the ergonomic design, closely fits the ear canal, has a natural appearance, is not easy to fall off, and is comfortable to wear. The compact and lightweight hearing aid case is convenient for you to carry it to any occasion. 【Hearing aids Rechargeable】It is a USB rechargeable hearing aids that can be placed in the base for wireless charging without frequent battery replacement. The hearing aid for the elderly can be charged quickly for 2-3 hours and work for up to 15 hours. It is a perfect all-day hearing aid.