The Reizen mighty loud ear 120 db personal sound hearing amplifier for the hearing impaired is a powerful amplification device with built-in microphone. The loudness of this personal sound amplifier is user controlled with the variable volume control dial which also serves as the on/off switch for ease of use. The red Led on top of the unit glows when it is turned on. This lightweight, compact Reizen loud ear personal amplifier can pick up sounds at a distance up to 100 feet away so you can really tune in to what is going on nearby. A handy built-in belt clip allows you to attach it to your belt, shirt pocket, or clothing so you can always keep it with you. It includes 2 AAA batteries for power and dual earphone. Additional earphones are available to use as spares or replacements. Whether you're using this device as an alternative to a hearing aid, or you just wish to hear better in noisy surroundings, this amplifier will help you listen in all types of situations. The built-in microphone does a good job enhancing weak sounds and voices. If you're struggling to hear conversations or other noises, this is the device for you.