The LD3320 board with Extended Fittings - Raspberry Pi RoHS is a power supply module developed by Waveshare. It is designed to make a Raspberry Pi more robust and easier to use. The board features a dual DC power input that supports 5.5mm 2.1x5.5mm barrel plug and terminal block. It has a DC input voltage range of 5-27V. The board has an LED indicator that signals when the power is on and displays the module’s current. It also has a digital switch that allows the user to switch between 3 different voltage output levels - 3.3V, 5V and 12V, with a maximum current of 3 Amps. The board has an on/off switch, and it is designed to be compatible with the Raspberry Pi 3 Model B,3 Model B+, Zero W, Zero, 4B and 4B+. This product is RoHS compliant and manufactured by Waveshare.