Specifications 

1. Max Sound Output: ≤130dB + 3dB 

 2. Max Sound Gain: 50dB ± 5dB 

 3. Average Sound Gain: 42dB ± 5dB 

 4. Harmonic Wave Distortion:  ≤5% 

 5. Frequency Range: 300Hz~4500Hz

 6. Input Noise: ≤ 29dB+3dB 

 7. Battery: Rechargeable polymer lithium ion

 8. Rated Current: ≤ 5mA

 9. Working Voltage: DC 3.7V

【Comfortable】- Generation smart chip brings a 28.2% performance upgrade over the previous generation. Excellent sound quality and comfortable listening. segmented noise reduction. 【Rechargeable】- Charging 3 hours, 24 hours can be used. Equipped with a built-In high capacity rechargeable lithium-Ion battery and Packed with a charging cable for easy charging. Say goodbye to the hassle of constantly buying expensive batteries which have low autonomy. Besides, it is environmental-friendly.  Charging Instruction The USB port connect to the 5 V charging base adapter, the blue indicator light on means (on charging), and the green indicator light is fully charged  【Adjustable】- 3 different frequency modes and each for 5 types of volume for your choices to ensure that you can hear clear sound in different volume environments. Automatic memory will keep the volume and program last time you set it. Please use the correct wearing method to ensure that the hearing closely matches the ear canal to avoid sound feedback and howling. It is an ideal hearing companion for people with hearing impairment who Running, Jogging, Hiking, Yoga, Talking, or watching TV. Accessories & Packing 1. Hearing aid 1pc 1. Product size:3.48x1.7x0.85cm 2. USB 1pc 2. Product N.W.: 4g 3. Protecting case 1pc 3. Product G.W.: 179g 4. Brush 1pc 4. Color box size: 13.7x9.8x4.5cm 5. Ear domes 2pcs 5. Carton size: 36x36x36cm 6. Sound tube 1pc 6. Quantity per carton: 56 boxes/CTN
7. Manual 1pc 7. G.W.: 11kg/CTN