Digital Hearing Amplifier: Enhances hearing with clarity Universal Fit: Designed to fit behind-the-ear for comfort Simple Battery Operation: Easy-to-use, battery-operated design Noise Reduction: Active noise reduction and selectable listening modes Interchangeable Ear Tips: Seal-out the noise for better listening Multiple Listening Modes: Normal, Noise-Cut-Down, Outside, In-House Ergonomic Design: Prevents occlusion effect for natural sound Left or Right Ear Use: Can be used in either ear Wider Dynamic Range Compression: Ensures clearer sound Overcharge/Discharge Protection: Prolongs battery life