1The size of the hearing aid host machine is 653713mm, which makes it easy to store and carry. 2There are two modes in this hearing aid, one is general mode, the other is silent mode, the default is general mode after boot. 3Intelligent noise reduction, automatically adjust the sound to the comfortable range, so as to protect the hearing and sound more real and delicate. 4Large power design, suitable for 120dB hearing loss crowd, practical accessories. 5External audio interface, convenient audio input, separate volume adjustable. Condition: 100% Brand NewItem Type: Hearing AidsMaterial: PlasticHost Size: Approx. 6.5 x 3.7 x 1.3cm / 2.6 x 1.5 x 0.5inScope of Application: Applicable to hearing impaired peopleMaximum Saturation Sound Pressure Level: 135dBFull-Gear Sound Gain (hf average gain) : 65dBHarmonic Distortion: 7%Equivalent Input Noise: 25dBFrequency Response Range: 300Hz--4600HzRated Current Consumption: 2.1mAPower Supply: 1pc AAA battery (Not included)Usage:1. Select a suitable earplug and insert it into the receiver2. 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 aid4. Place a receiver with earplugs in the earNotes: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 use2. Power off: turn down the on key and turn it off when you do not use the hearing aid3. High volume will cause injuries. Please make sure that the volume control button is in an appropriate position before turning on4. Adjust the volume by moving slowly until it reaches the most appropriate volume 1 x Receiver1 x Host3 x Earplugs1 x Hanging Rope1 x Description1 x Screwdriver