5pcs MP1584 3A Adjustable DC Step Down Converter Buck Module 3.3V 5V 9V 12V 24V Adjustable non-isolated DC buck voltage regulator, ultra small module 22x17x4mm Great for LED lights, micro-controllers, battery chargers, and most other low power devices. Input: 4.5-28V, Output:0.8-20V, 3A Peak / 1.5A Sustained Efficiency: Up to 92% (depends on the difference between input and output voltage) This module uses synchronous rectification, the most efficient power conversion available. 1.0MHz Switching Frequency, Product Guarantee We offer a 30 day return policy and a one year warranty. Buy with confidence! Item Location All orders ship from Indianapolis, IN, USA Similar Items 5x 3.3V Fixed Output $7.99 Free shipping 5x 5V Fixed Output $7.99 Free shipping 100W Boost w/ Voltmeter $8.59 Free shipping 5A Buck w/ Voltmeter $8.69 Free shipping 2pcs 5A Buck w/ Constant Current $8.19 Free shipping 130W Synchronous Buck/Boost (98% Efficiency) $18.59 Free shipping 5A Buck w/ Voltmeter & Digital Control $6.99 Free shipping