Rechargeable BTE Hearing Aid for Seniors with Volume Control Lightweight Design brand new and high quality BTE Hearing aid Max Sound Output: 129dB 4dB Max Sound Gain: 50dB 5dB Harmonic Wave Distortion: 5% Frequency Range: 450~3500 hz Input Noise: 30 dB Battery: AG13 Working Voltage: dc1.5V Working Current: 4mA Color: As the picture shows Item Size: 5.3 x 4.4 x 1.0cm Package Size: 7.5 x 10 x 3.2cm Net Weight: 8g Transition: 1cm=10mm=0.39inch Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package included: 1 x X-168 Hearing aid 2 x Earplug (different sizes) 2 x AG13 button cell battery 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'for t use it for long for time.