NOTE: This item comes with US plug/ charger, please confirm the voltage before placing an order.This hearing amplifiers is a great solution for those who are suffering bad hearing condition or hearing loss. Professiuonal audiological theoretically designed with digital sound noise reduction processing, this ear device actively reduces background noise to provide great hearing experience to the maximum. With handy working mode switch button and volume control button, the user can make accurate adjustments in no time. A wonderful choice for the hard-of-hearing people, the deaf, the elderly, the hearing-impaired, etc.Features- SOUND AMPLIFIERS: Designed by expert audiologists with professional sound noise reduction process, provide clear and loud sound. Help the user rediscover the pleasure of listening to nature& 39;s sounds or talking to others.- SUPERIOR DESIGN: Mini size and light weight, the hearing aid kit can easily fit into your pocket for easy storage and add no burden to your ear.- EASY TO USE: With handy on and off button and volume control that allows the user to make accurate adjustments in no time.- COMFORTABLE: silicone ear buds won& 39;t hurt your ears, offering the most comfortable wearing.- WIDE USE. Suitable for hard-of-hearing users, the deaf, the elderly, the hearing-impaired, etc.Specifications- Color: As shown- Material: ABS, silicone- Item Size: 5 x 4.8 x 0.86 cm- Type: Mini BTE Hearing aid- Max Sound Output: 130dB 5dB- Max Sound Gain: 38dB 5dB- Harmonic Wave Distortion: 5%- Frequency Range: 300~4500 Hz- Input Noise: 30 dB- Battery: Rechargeable NI-MH Battery- Working Voltage: DC 3.7V- Working Current: 4mA Note:- Adjust volume to the minimum before wearing, and increase volume gradually to avoid sudden increase in sound.- Choose an earplug of slightly bigger size to avoid whistler.- Increase volume gradually to avoid sudden increase in sound.- If you hear a howling, check the ear (silica gel) is appropriate and whether the size of plug is tight, the appropriate choice of earplugs and plugged, make sure no air leakage.- Keep the ear plug clean.- Remove the battery if you don& 39;t use it for long time.Packing lsit1 x Hearing aid 1 x Charger1 x User manual