SIMPLE TO USE: This hearing aid has normal mode and mute mode, you can switch modes according to different environments. Normal mode for noisy environments and mute mode for indoor quiet environments. 7-levels volume control can match your hearing condition more accurately. POWERFUL HEARING ASSIST: This pocket hearing aid works well for mild to severe hearing loss with peak sound gain around 70 dB and 139 dB SPL, it can amplify sounds much more than other ordinary hearing devices. The three knobs of fine-tuning system can provide more personalized settings while protecting your hearing, comes with screwdriver to make adjustments which is nice for different hearing loss levels. If the sound is too loud for you, you can adjust the fine-tuning buttons on back. LONG BATTERY LIFE: The hearing aid was built-in large capacity lithium battery, it can be used for about 80 hours with one charging of 2-3 hours, which can meet your short-term travel or business needs for one week. PORTABLE DESIGN: The back clip on hearing aid can be clipped to your belt or pocket. In addition to this, you can use the lanyard come with hearing amplifier to hang the device around your neck to prevent your hearing device from being lost. COMFORTABLE WEARING: Compared with other hearing aids, the receiver of this hearing amplifier is far away from the microphone, it is NOT easy to produce acoustic feedback(howling). Coming with different sizes medical garde ear plugs to fit best for your ear canal. You can enjoy TV shows on the sofa at home or walk with your family to the park.