The Oiyagai 2pcs DC DC Voltage Regulator Power Supply Buck Converter Module is an ideal solution for all your voltage regulator needs. It offers a wide input voltage of 6-40V and a constant 5V/3A output, making it perfect for various applications such as smartphones, tablets or power banks. With a high efficiency of up to 92% and a switching frequency of 150KHZ, it is an efficient and reliable device that gives you an optimal result. The module is easy to install and its size is 59 mm x 21 mm x 17 mm / 2.32 x 0.83 x 0.67 inches (L x W x H), which makes it compact and space-saving. With its dual USB ports, it is also a practical DIY USB charger that helps you charge your devices.