new and high qualitybr br Featuresbr Made of high quality material, solid, durable and strong conductivity.br Large LCD can display input/output voltage, output current/output power/output capacity/output for time, easy to read.br CNC adjustment is very accurate and fast, and it also can boost and step down voltage. Output voltage can be adjusted from 0.5-30v, while limited current can be adjusted 0-4A as you desired.br It features anti-reverse connection for protection of input end, which will not burn out, safe to use.br Anti-reverse irrigation at the output end, no additional anti-reverse irrigation diode is needed to charge the batterybr The module can be set to open/close by default, easy to use.br It has software for protection mechanisms are available, and the for protection threshold is adjustable.When the working parameters of the module exceed the for protection threshold, the output will be automatically closed.br Output ripple is small and PI filter is available.br Thicken radiator fins helps the module to dissipate heat quickly, long life.br br Specificationbr Model ZK-4KXbr Material Fiber glass board, Electronic componentbr Size 7.9 x 4.3 x 2.6cm/3.11 x 1.69 x 1.02inbr Color As picture shownbr Quantity 1 Pcbr Productbr Parametersbr Input Voltage 5.0-30vbr Output Voltage 0.5-30vbr Output Current It can work stably at 3A for a long for time, and can reach 4A under enhanced heat dissipation.br Output Power Natural heat dissipation 35W Strengthen heat dissipation 50Wbr Voltage Display resolution 0.01Vbr Current Display resolution 0.001Abr Conversion Efficiency about 88br Soft Start Yes The soft start may fail when it starts with high power and load module.br for Protection Mechanismbr Input Anti-reverse Connectionbr Output Anti-reverse Irrigationbr Input Undervoltage for Protection 4.8-30V adjustable, default 4.8Vbr Output Overvoltage for Protection 0.5-31V adjustable, default 31Vbr Output Overcurrent for Protection 0-4.1A adjustable, default 4.1Abr Overpower for Protection 0-50W adjustable, default 50Wbr Overtemperature for Protection 80-110 adjustable, default 110br Timeout for Protection 0-100h adjustable, OFF by defaultbr Super Capacity for Protection 0-60AH adjustable, OFF by defaultbr Operating Frequency 180KHZbr br Notebr No package.br Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.br Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank youbr br Package includesbr 1 x DC-DC for Buck Boost Converter