Features: – Convenient Hearing Amplifier – Compact Behind-the-Ear (BTE) Design – Adjustable Volume Control – Golden Styled Earplug / Earphone Receiver – Noise-Cancelling & Voice Clarifying Technology – Microphone Effectively Reduces Background Noise – Tested to Provide a More Comfortable Listening Experience – ASC (Automatic Signal Control) Regulates & Balances Sound – Battery Operated, Requires (A312) Button Cell Battery, Included – Universal Size Fits All Ear Shapes & Sizes – Switchable Ear (Left / Right) Compatibility – Comes with (3) Different Sized Ear Plugs / Tips – Power ON / OFF Switch Technical Specs: – Max Sound Output: 127±5dB – Sound Gain: >48dB – Harmonic Distortion: <8% – Frequency Range: 200-3500hz – Input Noise: <30dB – Current: <4 mA – Voltage: D.C. 1.4V – Dimensions (L x W x H): 1.6” x 0.8” x 0.3”