NOTICE: Each package only have one hearingaid, It could be worn on both left and right ear . So , if you want wear a pair of hearing aids , you could buy two products . Mini ITE Hearing aid: Max Sound Output: 120 dB Max Sound Gain: 30 dB Harmonic Wave Distortion: f1000Hz4% Frequency Range: 2503800 Hz Input Noise: 50 dB Battery: AG3 Working Voltage dc1.5V Working Current: 4mA K-80 is a SUPER MINI ear amplifier with lightweight and can be used in either ear,it's a good choice when you watching the TV, enjoy the movies, opera, entertainment, and have claes and attending the meeting, it will help you regain your hearing so you can live the life you're used to. 1. Lightweight personal sound amplifier maximizes the natural ability to hear sounds 2. Designed to fit either ear 3. Comes with 4 different tips for a comfor Package included: 1 x K-80 Hearing aid 4 x Earplug (different sizes) 1 x User manual 1 x Box Note: Adjust volume to the minimum before wearing. Choose an earplug of slightly bigger size to avoid whistler. Increase volume gradually to avoid sudden increase in sound. If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage. Keep the ear plug clean Remove the battery if you don't use it for long time.