Features: This product is a DC-DC step down converter module with a fixed voltage output. On-board screw terminal and DC 5.5X2.1mm dual power input jack with 6-40V voltage input. With dual USB power output interfaces, 5V fixed voltage output and maximum 3A current output. The high current output can be used as a DIY USB fast charger for smartphones and tablets, or as a 9V / 12V / 24V / 36V to 5V power converter module. The maximum conversion efficiency is 92%, high efficiency and long service life. Specifications: Condition: 100% Brand New Material: ABS, Metal Input: 6V-40V (DC5.5/2.1 socket, terminal block) Output: 5V/3A (MAX) (with Apple identification resistor) Efficiency: 92% (MAX) Switching frequency: 150KHZ Working temperature: -40℃-+85℃ Load capacity: maximum output 3A (can bring two mobile phones at the same time) Scope of application: USB 5V powered devices such as mobile power, mobile phones, and tablets Product size: approx. 50*38*15mm / 2*1.5*0.6in Package list: 1 * Step Down Module 1、This product is a DC-DC step down converter module with a fixed voltage output 2、On-board screw terminal and DC 5.5X2.1mm dual power input jack with 6-40V voltage input 3、With dual USB power output interfaces, 5V fixed voltage output and maximum 3A current output 4、The high current output can be used as a DIY USB fast charger for smartphones and tablets, or as a 9V / 12V / 24V / 36V to 5V power converter module 5、The maximum conversion efficiency is 92%, high efficiency and long service life