Left ear color: blueMaterial: ABS+SiliconeBattery: 1 x button battery. (up to 600 hours of battery life)Frequency response range: 300HZ-4500HZ.Total harmonic distortion: ≤ 7% + 3%.Features:-The deaf-aid has high power, open design and clear sound quality, which can reduce the noise caused by chip and restore natural sound.-The deaf-aid uses a button battery, it can work up to 60 hours and is very durable.1. Keep the earplugs clean3. Remove the batteries if not used for a long time5. Before wearing, please turn the volume to the minimum and gradually increase the volume to avoid the sound suddenly become louderPackage includes:1x Hearing Aid1x Instruction Booklet1x Cleaning Brush5 X EarplugsOne pair:2x Matching Batteries2x Gift Boxes2x Screwdrivers