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 requirements on volume and weight (such as aircraft models, etc.). Model/Name: Ultra-Small DC-DC 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 that this module within its working range before using. Please 't output short circuit, otherwise the board would burn out. When setting the parameter, please make 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 () Conversion efficiency: 92% (high) Output ripple: Less than 30mV Switching frequency: 1.5MHz (high), typical 1MHz Operating temperature: -45C~ +85C 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 converter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.