Features:1. 4 volume levels, amplifying sounds up to 40 decibels, a good choice for you.2. Portable for travel, outdoors and some situations require amplification of sounds.3. 1.5v mini battery, low consumption and durable.4. Provide best help for you with auto noise reduction, super sensitivity and condenser micro.5. Gradually adjust it to a suitable level, preventing from injuring hearing.