For RPi relay board enables your Pi to control high voltage/high current devices, making ordinary household appliances smart easily. High quality JS1-5V-F power relay, load up to 10Amp/250VAC, 5Amp 30VDC. Terminal block: Pitch - 5.0mm/0.197Inch, wire diameter 26-12 AWG/2.5mm square, stripping length 7mm/0.28Inch, metric M2.5 slotted screw. 2 x 20-pin extension pin header, height 10mm/0.39 inch. The cooling fan adopts active cooling mode design, and the heat can be discharged in time. The LED and fan have switches, which can control the LED and fan separately, and there will be no glare when used at night. Product Description: RPi-Relay-Board-(C) For RPi power relay board expansion module with dual cooling fans and auto color changing LED. Due to different batches, there may be differences in product appearance, color, and printed text, which will not affect the use. Colour:Black Material:PCB Package Contents: 1 * Extended board Kit(Accessories color and appearance are random, no specification is accepted) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.