ITEM NAME:5A DC to DC CV Lithium Battery Charging Board Led Drive Power Converter Ki M1S2 HOT SALE body .shopclass { float: left; width: 100%;.Output current: adjustable maximum 5A Conversion efficiency: 95% (the highest) Switching frequency: 180KHz. Output ripple: 50mV (max) 20M bandwidth Load Regulation: ± 0.5%. You can follow below process to chontact us.