Specification: 100% Brand new and high quality Pocket Hearing aid Max Sound Output: 129±4 dB Max Sound Gain: 58dB ± 5dB Harmonic Wave Distortion: f<1000Hz≤15%,f＞1000Hz≤10% Frequency Range: 450~3500hz Input Noise: ≤30 dB Battery: 1 x AAA battery (No included) Working Voltage: dc1.5V Working Current: ≤4mA Package included: 1 x Hearing Aid 1 x Headset Notes: 1.Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2.Due to the manual measurement and different measurement methods, please allow 1-3cm deviation.