Rechargeable Audio Amplifier, Voice Enhancer Device, Hearing Assistance for TV and Talking (2 Pieces) by Amazon.co.uk

• Up 30 Hours Working Time Once Fully Charge

• Intelligent Noise Reduction System , Detect and Recognize the Noise Wave, Change the Gain of the Channel Where the Noise is Located, Make Normal Speed More Clearly

• Ultra-Low Machine Itself Background Noise , and Ultralight Weight Body You Don't Even Feel Wearing It

• Knob Volume Control: You can Just Use One Finger to Adjust the Volume When the Deivce in the Ear Canal

• Comfort Threshold Control ; Automatic Gain Control-Output for Hearing Protection, No Need to Suffer from Sudden Loud Noise Anymore