Specification: Brand new Maximal Sound Output: ¡Ü 80dB ¡À 5dB Input of Adapter: 100-300V Alternating Current 50/60HZ 0.15A Both ears can use. Fine workmanship and good performance. Small size, light weight. Convenient to use and carry. Long service life. Package included: 1 x Digital Hearing Aid (blue or silver) 4 x Earplug 1 x Cleaning Sweeper 1 x USB Cable Note: Adjust volume to the minimum before wearing, increase volume gradually to avoid sudden increase in sound. To protect your hearing, please don't use this product at high volume for a long time. Please allow a little size errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.