Spcifications: Wide operating voltage range: 3V12V; suggestion 5V. Speaker power: 0.5W10W , suggestion 8W speaker is best ! Size:18x40x18mm Suitable For: Tape recorders and radios being Features Very few external components; Low distortion; Onboard volume control potentiometer clockwise to increase the volume; With power indicator light; Package included 4 X LM386 Module