--------------------------------------------------------------------------------- Sold and shipped by Japanese sellers * Operated by Japanese sellers - Japanese sellers with trust and experience. * Direct from Japan - All items are carefully packed and shipped promptly from Japan. * Highest quality control - Inspected by Japanese standards to ensure high quality products. --------------------------------------------------------------------------------- In combination with a microcontroller, it is possible to turn on/off large current devices such as motors. This is a set of 4. When combined with the separately sold Model Illumination LED System , the device can be turned on/off using an infrared remote control. Devices that can be connected can use up to a maximum voltage of 40V, a maximum current of 2A, and an instantaneous current of 4A. Multiple devices can be connected within the current range. The ultra-compact size of 14mm x 7mm makes it easy to incorporate inside small models. You can use your favorite microcontroller as long as it can be turned on/off with 3V. Even if the voltage is 3V or higher, it can be connected by adding an additional resistor. Normal microcontrollers cannot directly turn on/off large current/high voltage devices such as motors, but by using this board, you can easily control devices with a maximum voltage of 40V, maximum current of 2A, and instantaneous current of 4A. It becomes possible to control. Control is possible by simply connecting the microcontroller's GPIO and GND to the control side terminals and switching GPIO between high and low. By combining it with the Model Illumination LED System sold separately at the Nazo Tech Store and connecting this board instead of the LED, you can control the device from a distance using an infrared remote control.