Features These are buck converter modules used for voltage step-down that input voltage is higher than output voltage. The input voltage range is 4V to 38V DC, and the output voltage is adjustable from 1.25V to 36V. These buck module can be remarkably efficient, and the maximum efficiency can be up to 96%), making them very useful. This set contains total 10 pieces DC-DC buck modules that you can use for many different projects. They are great step-down modules for accumulator, power transformer, DIY adjustable regulated power supply, laptop power supply on car and industrial equipment. Description:This is a set of 10 pieces DC-to-DC buck(step-down) power converter modules which step down voltage from their input (supply) to their output (load). These buck module can be remarkably efficient (maximum 96%), making them useful for voltage step-down that input voltage is higher than output voltage, such as accumulator, power transformer, DIY adjustable regulated power supply, laptop power supply on car and industrial equipment. Specifications:Type: Non-isolated DC-DC step-down moduleInput Voltage: 4V to 38VOutput Voltage: 1.25V to 36V(adjustable continuously)       Output Current: 0A to 5AOutput Power: 75WOperating Temperature: -40°C~+85°CFrequency: 180KHzEfficiency: 96%(Max.)Load Regulation: S (I)≤0.8% (input 24V, output 12V, load measured from 1~4.5A variation)Voltage Regulation: S (u)≤0.8% (output 12V, 4A, voltage measured from 18~32V variation)Short Circuit Protection: Yes ( limit current 8A)Over Temperature Protection: Yes (shut off output automatically)Mounting Method: 2pcs 3mm screwsWiring Method: SolderingSize: 54 x 23 x 15mm / 2.12 x 0.9 x 0.59"Quantity: 10 Package Includes:10 x Step-down Voltage Modules Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List 10 x Buck Module