Walker's Ultra Ear Bite Deluxe Hearing Amplifier increases hearing in a variety of situations. Compact behind-the-ear design can be used in either ear. Lightweight. On/Off switch. Mild compression circuit. dB limiting. Power source: #LR-44 battery. Included: unit, sound tube, 3 tulip tips (one of each size small, medium and large),3 batteries and 2 maintenance tools.