Product details of Personal Sound (F-16P Pocket Hearing Aid) for Elders Moderate Hearing Loss (3 Month Seller Warranty) AXON Personal Sound (F-16P Pocket Hearing Aid) for Elders Moderate Hearing Loss Pocket Hearing Amplifier with Volume Control Wheel and N-H-O Switch Max Sound Output: 110dB ± 5dB. Peak Gain (dB)≤ 60 Total harmonic wave distortion: ≤ 5%. Frequency range: 300-4000 Hz Suitable for Users with Moderate hearing loss. Brand AXON Colour White Model Name F 16P Fit Type In-Ear Number of Batteries 1 AA batteries required. (included)