Maximum File Acoustic Gain: 58dB ± 5dB, Harmonic Distortion: 5%, Equivalent Input Noise: 30dB, Standard Battery: 1 x AAA Battery, Operating Voltage: dc1.5V, Operating Current: 4mA Warranty not applicable on Wire / Microphone / damaged / battery leakaged productItem Please read the Instructions Manual before using the Product. Type: Ear Care, Material: ABS, Model Number: Auditech V 99, Size: 6.1 x 4.1 x 1.6cm, , Maximum Saturation Sound Pressure: 129dB ± 4dB