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 AA battery (No included) Working Voltage: dc1.5V Working Current: ≤4mA Colour: As the picture shows Size: 6.1 x 4.1 x 1.6cm Package Included: 1 x Hearing Aid 1 x Headset 4 x Earplug(Different Size) 1 X Exquisite Package box 1 x Instruction manual (English) Battery:No included （Hearing aid you receive will not come with AAA battery,as it can not ship by air.） .