About this item Internal Configuration- Utilizing a duplex adjustment potentiometer and a double-sided circuit board. Features high-frequency power supplement dedicated capacitor for enhanced performance. Main Function- This voltage regulator can connect to loads within 2A, compatible with both AC and DC input voltage, and allows for a continuously adjustable output voltage ranging from DC 1.25V to 28V. Digital Tubes- Equipped with digital tubes to display output voltage, ensuring visibility of the output voltage at a glance. Warm Tips- The working voltage of the digital tubes is 4.5V; therefore, the variable voltage regulator displays normally only when the voltage exceeds 4.5V. At an input of 5V, it can output from 1.25V to 2V but will not provide a higher voltage. Heat Dissipation- Equipped with a heat sink, this voltage booster effectively dissipates heat when in use, ensuring optimal performance and reliability. Size: 2.36 x 2.83 x 1.06 inches