Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. specification: Condition: Brand New_x000D_Item Type: Hearing Aids_x000D_Material: Plastic_x000D_Host Size: Approx. 6.5 x 3.7 x 1.3cm / 2.6 x 1.5 x 0.5in_x000D_Scope of Application: Applicable to hearing impaired people_x000D_Maximum Saturation Sound Pressure Level: 135dB_x000D_Full-Gear Sound Gain (hf average gain) : 65dB_x000D_Harmonic Distortion: 7%_x000D_Equivalent Input Noise: 25dB_x000D_Frequency Response Range: 300Hz--4600Hz_x000D_Rated Current Consumption: 2.1mA_x000D_Power Supply: 1pc AAA battery (Not included)_x000D__x000D_Usage:_x000D_1. Select a suitable earplug and insert it into the receiver_x000D_2. Insert the receiver wire into the receiver (pay attention to the size of the two holes on the receiver)_x000D_Plug the receiver cable into the USB port on the hearing aid_x000D_4. Place a receiver with earplugs in the ear_x000D__x000D_Notes:_x000D_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_x000D_2. Power off: turn down the on key and turn it off when you do not use the hearing aid_x000D_3. High volume will cause injuries. Please make sure that the volume control button is in an appropriate position before turning on_x000D_4. Adjust the volume by moving slowly until it reaches the most appropriate volume Features: 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. PackageList: 1 x Receiver 1 x Host 3 x Earplugs 1 x Hanging Rope 1 x Description 1 x Screwdriver