1,This boost/buck module can step up or step down voltage and maintain a stable output voltage 2,It supports output voltage stability function, voltage regulation function and under-voltage protection 3,With high conversion efficiency and high power, it has better performance and is very convenient to use 4,It has quite low output ripple voltage, for example, 20mV when output is 12V 3A, which is great for powering speaker, audio amplifier, artificial circuit, etc 5,This module can be powered by phone charger or battery, and output adjustable 0.5V to 30V DC power Description: This DC-DC converter module is a buck (step-down) converter combined with a boost (step-up) converter, of which output voltage can be lower or higher than the input. It features small size, high power, high efficiency and stable performance. It would maintain output voltage stability when input voltage is higher, lower than to output voltage. Features: This boost/buck module can step up or step down voltage and maintain a stable output voltage. It supports output voltage stability function, voltage regulation function and under-voltage protection. With high conversion efficiency and high power, it has better performance and is very convenient to use. It has quite low output ripple voltage, for example, 20mV when output is 12V 3A, which is great for powering speaker, audio amplifier, artificial circuit, etc. This module can be powered by phone charger or battery, and output adjustable 0.5V to 30V DC power. Specifications: Input Voltage: 4.5V-30V Output Voltage: 0.5V-30V Output Current: 3A (or 4A if enhance heat dissipation) Output Power: 30W (or 60W if enhance heat dissipation) Output Ripple Voltage: 30mV (full-load) Conversion Efficiency: 88-91%(step up); 87-90%(step down) Short Circuit Protection: Yes Frequency: 180kHz Size: 48 x 23 x 21mm / 1.89 x 0.9 x 0.82" Package Includes: 1 x Module Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.