1、INPUT AND OUTPUT: The input port is equipped with 5.5mmx2.1mm DC socket and wiring terminal, each mode can make the module work, but also can be connected at the same time; The output ports are USB and wiring terminals, which can output power at the same time 2、EFFICIENT CONVERSION: The module adopts new technology synchronous rectification, which significantly improves the conversion efficiency and expands the working voltage and current 3、MINI AND PORTABLE: The product size is 51x30x15mm, suitable for a variety of narrow installation space and small case 4、WIDELY USED: Module can be used as USB 5V buck converter, DIY mobile phone charger, modified car charger, power for Raspberry PI 4b 5、TECHNICAL PARAMETERS OF MODULE: 4.8APD power maximum 27W(dual port output without fast charge), USB A output 5V, USB C no output, dual port with automatic plug and pull detection function Item Type: DC to DC Buck Converter Maximum Output Current of Two Ports: 4.8A, PD Maximum power 27W(two ports output at the same time without fast charge), enhance ventilation and heat dissipation for a long period of high current use Switching Frequency: 150KHz Conversion Efficiency: Typical value 96% Output Support Protocol: QC2.0 or QC3.0: 9V, 12V PD2.0 or PD3.0: 5V3A, 9V3A, 12V2.25A, 15V, 20V PPS3.3V-5.9V3A, 3.3V-11V3A(20mV per step) BC1.2, for FCP, AFC, FSCP, for OPPO fast charge protocol VOOC(VOOC requires for OPPO special data cable) Input Backconnection Protection: None(please confirm that the positive and negative poles are re energized or add a series of 2 pole tubes by yourself) Size: Approx. 51 x 30 x 15mm / 2.01 x 1.18 x 0.59in 1 x DC to DC Buck Converter