Best Sound Amplifier Adjustable Tone Hearing Aids Aid X-136 Hot Selling Specifications: Pocket Hearing aid Max Sound Output: 1294 dB Max Sound Gain: 55dB 5dB Harmonic Wave Distortion: 5% Frequency Range: 450~3500 hz Input Noise: 30 dB Battery: 1 x AA battery (NOT included) Working Voltage: dc1.5V Working Current: 4mA Color: As the picture shows Item Size: 7.0 x 4.2 x 1.8cm Package Size: 8.2 x 12.5 x 4cm Net Weight: 28g Package included: 1 x X-136 Hearing aid 2 x Earplug (different sizes) 1 x User manual Note: Adjust volume to the minimum before wearing. 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't use it for long time. Company information In 2019, it invested and set up a factory in Xiamen to build a large domestic hearing aid production and r&d base with an area of about 12,000 square meters. Since the introduction of automatic production system in 2018, the company has taken the lead in realizing automatic production of hearing AIDS in China. Accurate automatic operation has greatly improved production capacity and made quality more stable