Feature: 1. CONSTANT CURRENT WITH PROTECTION: DIY a regulated power supply with constant current function, not afraid of short circuit during use, can protect the load. Can prevent the battery from overcharging and effectively protect the battery. Can drive high power LEDs and can be freely combined in series and parallel 2. APPLICATION RANGE: Power supply for electronic equipment, charge various batteries, set charging voltage and charging current according to batteries of different voltages and capacities. For example, can be used as a car power supply to supply power to mobile phones, notebook computers or various digital products 3. INPUT OUTPUT PORT: Input port is 5.5mm×2.1mm DC socket and wiring terminal, each channel enables the module to work, and can also be connected at the same time; Output port is USB and wiring terminal, which can output power at the same time 4. HIGH EFFICIENCY TRANSFORMER: The module adopts new technology synchronous rectification, which significantly improves the conversion efficiency and expands the working voltage and current 5. MULTIPLE APPLICATIONS: As a USB 5V buck converter, a DIY mobile phone charger, a modified car charger, powering for Raspberry Pi 4b Specification: Item Type: Voltage Regulator Board Power Protection: No Input Voltage: DC6-30V Output Voltage: 5V (with for iOS identification resistor) Output Current: 2A (maximum) Current Limiting Range: None Working Frequency: 150KHz Conversion Efficiency: Up to about 92%, related to differential pressure and use environment Output Ripple: None Minimum Voltage Drop: 1V Working Temperature: 40℃ to +85℃ (please pay attention to the temperature of the power tube in actual use, if the temperature is too high, please strengthen the heat dissipation or derate the use) Potentiometer Adjustment Direction: Adaptive Wiring Method: DC5.5/2.1 socket, terminal block. Package List: 1 x Module1 x Power Cord1 x User Manual