Application areas: DIY mobile power supply, monitoring power supply, children's car power supply, camera power supply, vehicle power supply, communication equipment It is suitable for occasions with strict requirements on volume and weight (such as aircraft models, etc.). Model/Name: Ultra-Small DC-DC Buck Module You can adjust the voltage by placing a multi-meter on the output, synchronously, using a screw driver to adjust a potentiometer. It can be minute adjustments to achieve a precise voltage. Kindly reminder These boards are adjustable current limiting, fixed 3A current limit. Please make sure that this module within its working range before using. Please don't output short circuit, otherwise the board would burn out. When setting the parameter, please make sure output voltage is stable before using the module to avoid any possible damage. Input voltage: 4.5V~28V Output voltage.: 0.8V~20V Output current: 3A (large) Conversion efficiency: 92% (high) Output ripple: Less than 30mV Switching frequency: 1.5MHz (high), typical 1MHz Operating temperature: -45°C~ +85°C Size: 22mm x 17mm x 4mm (L*W*H) Warning: do not reverse the positive and negative terminals to avoid any possible damage; Do not use light load (less than 10% of output power) or without load Material: PC+Metal colour: green + black Package Contents: 12 x Mini MP1584EN DC to DC buck converter