The Wind NinJa RDH4010B2 4cm DC fan is a reliable cooling solution for your electronic devices. With a power rating of 2.16W and a fan speed of 8000rpm, it provides efficient cooling in a shape of a square with dimensions 40x40x10mm. This black plastic fan operates at a voltage rating of 24V and has a noise level of 25dB. It comes with a timer control of 2 days and a manufacturer warranty of 6 months. The fan is suitable for various electrical equipment and supplies, and has a maximum operating temperature of 70°C (158°F) and a minimum operating temperature of 0°C (32°F).