The Calrad 95-2038 Miniature audio amplifier is perfect for home, office or commercial installations. Selectable microphone and line level inputs by a 2 position slide switch. Removable 4 position solderless screw terminal speaker connectivity block. Rotary style volume control for input signal attenuation. Red power L.E.D. indicator. Low noise, super efficient class ‘D’ amplifier design. DC power supply included. Fits easily behind TV displays or in small equipment spaces.