Features: Sound amplifier helps amplify sound up to 30X with low background noise. Built-in rechargeable battery for convenient charging—no need to replace batteries. Fully charged battery supports 8-10 hours of continuous use. Keep ear tips clean and replace as needed. Interchangeable ear tips help seal out noise. Specifications: Plug Type: US/EU Battery: 1.2V Working Current: Less than 3mA Signal to Noise Ratio: Less than 28dB Frequency: 100-4000Hz Gain: 30dB Distortion: Less than 6% Material: ABS Size: 145 x 105 x 60mm Note: Actual color may vary slightly due to differences in monitor displays and lighting conditions. Includes: 1 x Hearing Aid (with 1 earbud) 1 x Charger 1 x Base 5 x Silicone Earbuds 1 x Cleaning Brush