Features 1.FR4‑A PCB: The circuit board is made of FR4‑A good quality PCB, and is tin plated, stable and beautiful 2.EASY TO WELD AND DEBUG: Contains few components, easy to weld and debug, board size is 37mmx41mm, small size and easy to install 3.SIMPLE WIRING: LM386 audio amplifier kit come with simple wiring, and wide power supply range from 3V to 12V DC 4.CONVENIENT TO GET ELECTRICITY AND DEBUG: With power indicator light, which is very convenient to get electricity and debug, etc. You can get electricity from the computer by using the USB to DC005 cable in the store 5.0.5W-10W SPEAKER: The driving speaker uses a 0.5W-10W speaker, the speaker is a non polar component, so will not burn out Specification Item Type: LM386 Audio Amplifier Kit Board Size: Approx. 37 x 41mm / 1.46 x 1.61in Working Voltage: DC 3~12V Drive Speaker: 1 x 0.5W-10W speaker Package List 1 x LM386 Audio Amplifier Kit(20pcs)