AXON C-109 Mini Rechargeable BTE Hearing Aid Voice Amplifier Volume Control - EU Plug Low noise and low distortion BTE (behind the ear) design,comfortable to use Help you to get a more clear sound and a better hearing N-H switch: N for normal work mode; H for reducing low frequency noise Volume adjustable,with 4 kinds of volume modes Built-in rechargeable high capacity lithium battery Suitable for people with severe hearing loss Come with 5 earplugs in different sizes Specification: Max Sound Output: 130dB5dB Sound Gain: 38dB5dB Total Harmonic Wave Distortion: 5% Frequency Range: 300-4000Hz Input Noise: 30dB Working Voltage: DC 3.7V Input: 100-240V,50/60Hz,150mA Output: 5V/500mA Color: Beige Size: 5cm x 5cm x 1.6cm Weight: 9g Package included: 1 x AXON C-109 Mini Rechargeable BTE Hearing Aid Headphone Amplifier 5 x Earplugs 1 x Charger 1 x Carrying Case 1 x User Manual