Features: 1. It has high-frequency tone REDuction, low-frequency tone control and output adjustment functions, and the final output sound is most suitable for the needs of each hearing-impaiRED person. 2. The product has two modes, normal and noise REDuction, which can be switched with one button to adapt to different environments. 3. The operation is simple and convenient, and it can be switched with one button, which is also convenient for the elderly to use. 4. Rechargeable lithium battery, large capacity, long working time, no need to replace batteries frequently. 5. The test range is 120DBHL, suitable for moderate to severe hearing loss. 6. The size of the hearing aid host is 653713mm, which is easy to store and carry. 7. External audio interface, convenient audio input, and the volume can be adjusted separately. 8. Intelligent noise REDuction, automatically adjust the sound to a comfortable range, protect hearing, and the sound is more real and delicate. Status: 100% Item Type: Hearing Aid Tool Material: Plastic Host Size: About 6.5 x 3.7 x 1.3cm / 2.6 x 1.5 x 0.5in Scope of application: suitable for people with hearing impairment High frequency average: 1284dB Full-frequency sound gain (high frequency average gain): 665dB Total harmonic distortion: 3+3% Equivalent input noise: 25+3dB Frequency response range: 300--4200KHz Rated current consumption: 6mA Power supply: lithium battery Battery capacity: 200mAh How to use: 1. Select the appropriate earplug and insert it into the receiver 2. Insert the receiver line into the receiver (note that the receiver =The size of the two holes on the top) 3. Plug the receiver cable into the USB port on the hearing aid 4. Place the receiver with earplugs Precautions: 1. Power on: Push the "Power on" button upwards, the "Power on" delay is 3 seconds, and make sure the sound is adjusted to the minimum state when starting to use 2. Power off: When the hearing aid is not in use, turn the power button down and turn it off 3. Excessive volume can cause harm, please make sure the volume control button is in the right position before turning it on 4. Slowly move to adjust the volume until the most suitable volume is reached Package includes: 1 x Receiver1 x Host3 x Earplugs1 x Lanyard1 x Instruction Manual1 x Screwdriver1 x USB cable