The hearing aid amplifier combines a cosmetically appealing look with the smooth sound an internal speaker. Filter out unwanted noise caused by airflow or wind. Deliver direct, powerful, and smooth sound right into your ear. Moisture resistant provides durability to most forms of moisture and wear. Separate wire and headphone, more convenient and safety. The hearing aid also provides improved technology for reduced electromagnetic interference. This hearing aid is suitable for severe hearing loss people. Smaller than a credit card, this mini hearing aid is discreet enough to fit easily in your pocket or handbag. Maximum Saturation Sound Pressure: 129dB Â± 4dB Maximum File Acoustic Gain: 50dB Â± 5db Harmonic Distortion: â‰¤5% Frequency Response: 450 - 3500Hz Equivalent Input Noise: â‰¤ 30dB Battery Type: AG 13 Button cell Operating Voltage: 1.5V Operating Current: â‰¤4mA Size: 5.3 x 4.4 x 1.0cm / 2.1 x 1.3 x 0.4in(L x W x H) Package Details: 1 x Hearing Aid, 2 x Button Cells, 2 x Earplugs. Disclaimer: Results will vary by individual.