Features: – Digital Hearing Amplifier – Universal Fit Behind-the-Ear – Simple Battery Operated Design – Interchangeable Ear Tip to Seal-Out the Noise – Selectable Listening Modes: Normal, Noise-Cut-Down, Outside, In-House – Unique Ergonomic Design to Prevent Occlusion Effect – Can be Used for Left or Right Ear – Active Noise Reduction – Over Discharge/Charge Feature – Wider Dynamic Range Compression – Simple Battery Operated Design What’s in the Box: – Hearing Amplifier – (3) Ear Bud Tips – (2) Batteries – Storage / Travel Case Technical Specs: – Input Noise: =28dB – Sensitivity: =40dB – THD: 4% – Max Sound Output: 125±5dB – Frequency Range: 200-6000Hz – Working Current: =4mA – Construction Material: Engineered ABS – Battery Type: A13 (Size 13) Button Cell (1.45V, 290mAh, 0.200Wh) – Dimensions (L x W x H): 4.21’’ x 0.37’’ x 0.94’’ -inches