Buck Converter Module Crystal- 3A Adjustable Step-Down Module DC-DC Buck Converter Adjustable Power Supply Module Power Supply 24v To 12v 5v 3v New I.1068445678 Dc Dc Buck Converter Designed with terminal block for easy and convenient wiring. WIDELY USED: Step down converter is widely used for lithium or wire-acid battery, low voltage system , 6V, 12V, 14V, 24V battery charging and regulated Voltage: The input voltage is 6-32VDC, the output voltage is 5VDC by default, and it will automatically adjust between 3V-12V after triggering fast charging., Conversion efficiency: 90%~97%. The LM2596S DC-DC 24V/12V To 5V 5A Step Down Power Supply Buck Converter Charging Module is a great tool for a variety of applications. The module is easy to use and can be connected to a variety of devices High Conversion Efficiency: High quality components ensure high conversion efficiency with up to 97% efficiency. Buy DC-DC 4.5-40V To 5V 2A USB Charger Step down Converter Voltmeter Module at Best Price It has USB output port that can be used to charge phone, mainly solves the rapid charging of batteries in different environments of hardware.