4PACK 6015 Fan 60x60x15mm DC 5V 60mm x 15mm Brushless Cooling Fan for Cooling DIY PC Computer Case Fan Rated Voltage: DC 5V, Current: 0.2A, Power: 1W USB powered. it can run these right off the laptop without an external power source 5V USB ports compatible with laptop, power bank and all standard USB outlets; don't need to buy additional cords Dimension: 2.36 x 2.36 x 0.59 in/ Bearings: Hydraulic / Current:0.25 Amp /Power: 1.2 W /Speed: 3500 RPM /Airflow: 18.2 CFM /Noise: 25.8 dBA / Lifespan: 35000 hrs 60x60x15mm usb fans,Good for cooling computer case, inverter, LED lights, humidifier, purifier, aroma diffuser, receiver, Compatible with raspberry pi, projectors and other DIY projects ventilation