2pcs Mini360 3A DC Voltage Step Down Power Converter Buck Module 3.3V 5V 9V 12V

Adjustable non-isolated DC buck voltage regulator, incredibly small module 17x11x3.8mm Great for LED lights, micro-controllers, battery chargers, and most other low power devices. Input: 4.75-23V, Output:1.0-17V, 3A Peak / 1.8A Sustained Efficiency: Up to 96% (depends on the difference between input and output voltage) This module uses synchronous rectification, the most efficient power conversion available. 340KHz switching frequency,