Features: – Includes (2) Hearing Amplifiers – Convenient Dual Audio Assistance – Compact Behind-the-Ear (BTE) Design – Adjustable Volume Control – Effectively Reduces Background Noise – Noise-Cancelling & Voice Clarifying Technology – Tested to Provide a More Comfortable Listening Experience – ASC (Automatic Signal Control) Regulates & Balances Sound – Universal Size Fits All Ear Shapes & Sizes – Comes with (3) Pairs of Different Sized Ear Plugs / Tips – Switchable Ear (Left / Right) Compatibility – Includes Storage / Travel Case & (4) Batteries – Battery Operated: (1) Button Cell A13 (LR44) Battery (Each) Technical Specs: – Max Sound Output: 128±5 dB – Sound Gain: >30 dB – Harmonic Distortion: <10% – Frequency Range: 300-4000hz – Input Noise: <40dB – Current: <4 mA – Voltage: D.C. 1.5V – Dimensions (L x W x H): 1.5” x 1.4” x 0.3”