Features： 1、With high frequency pitch reduction, low frequency pitch control and output adjustment, the final output sound best suits the needs of each hearing impaired person. 2、The product has two modes of normal and noise reduction, one?key switch to adapt to different environments. 3、The operation is simple and convenient, one key switch, also convenient to use even for the elderly. 4、Rechargeable lithium batteries, large capacity, long working hours, no need for frequently replacing batteries. 5、The range of testing is ≤120DBHL, suitable for moderate to severe hearing loss. 6、The size of the hearing aid host machine is 65×37×13mm, which makes it easy to receive and carry. 7、External audio interface, convenient audio input, separate volume adjustable. 8、Intelligent noise reduction, automatically adjust the sound to the comfortable range, so as to protect the hearing and sound more real and delicate. Specification： Item Type: Hearing Aids Material: Plastic Host Size: Approx. 6.5 x 3.7 x 1.3cm / 2.6 x 1.5 x 0.5in Scope of Application: Applicable to hearing impaired people High Frequency Mean Value: 128±4dB Full Range Sound Gain (hf average gain) : 66±5dB 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 Usage: 1. Select a suitable earplug and insert it into the receiver 2. Insert the receiver wire into the receiver (pay attention to the size of the two holes on the receiver) Plug the receiver cable into the USB port on the hearing aid 4. Place a receiver with earplugs in the ear Notes: 1. Power on: push the "on" key upward, and the delay of the "on" will be 3 seconds. Make sure that the sound adjustment is in the minimum state when starting to use 2. Power off: turn down the on key and turn it off when you do not use the hearing aid 3. High volume will cause injuries. Please make sure that the volume control button is in an appropriate position before turning on 4. Adjust the volume by moving slowly until it reaches the most appropriate volume Package List： 1 x Receiver 1 x Host 3 x Earplugs 1 x Hanging Rope 1 x Manual 1 x Screwdriver 1 x USB Cable