Feature 1. Mini BTE design 2. High power with chip noise reduction 3. 4 modes of operation, multifunctional design 4. Low power reminder, USB Rechargeable( Do not need to change battery ) 5. Charging 4-6Hours, working up 80 hours Specification Product Name:Rechargeable BTE Hearing Aid Color:Beige/Blue with charger head Charger:DC 5V150mA~1A Weight:App. 6.5g Size:15x40x10mm Maximum Output:129+4dB Maximum Gain:385dB Total Harmonic Distortion: 5% Equivalent Input Noise: 28 Package included 1 x Hearing aid 4 x Earplug (Different sizes) 1 x User manual 1 x storage Box 1 x USB charging cablewith the charge head Kindly Remind 1.Adjust volume to the minimum before wearing. 2.Choose an earplug of slightly bigger size to avoid whistler. 3.Increase volume gradually to avoid sudden increase in sound. 4.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. 5.Keep the ear plug clean. NoticeCharger INPUT: AC100-240V, 50-60Hz / 0.15AChargerOUTPUT: 5V, 1000mA1. Please use the matching charger to charge the product, otherwise the product may be damaged.2. If you need to use a replacement charger, please use a charger suitable for the product. If an inappropriate charger is used to charge the product, it will cause damage to the product.