LM317 DC-DC Converter: Output Current: 1.5A; Input Voltage: 4.2 - 40V Input Mode : VIN Input Positive Level , GND Input Negative; Output Mode: VOUT Output Positive Level , GND Output Negative Three-Terminal:LM317 Module Designed with Adjustable Three-Terminal Voltage Regulator Module,Which Can Replace All Three-Break Voltage Regulator Modules Such As 7805, 7806, 7809, 7812, 7824 Easy TO Use: On-Board Regulated Power Supply, Connect the Input End of Module to the Cigarette Lighter and Adjust the Potentiometer Adjustment Mode: The Output Voltage Can Be Adjusted to 1.25V-30V for Your Mobile Phone, MP3, MP4, PSP and Many Other Devices, Very Simple and Convenient to Use Specification: Output Current: 1.5A Input Voltage: 4.2 - 40 V Output Current: 1.5A (minimum), 2.2A (typ) Input to Output Voltage Differential (VIVO): 40V DC(max) Adjustable Output Voltage Range: 1.2 ~ 37V The Characteristic Frequency: 100 (MHz) Input: VIN Input is Level, the GND Input Negative Output Mode: Output of VOUT Positive, GND Negative Output The Maximum Output Current: the Maximum Output Current of =3/ (Input Voltage and Output Voltage) Package Contents: 6x LM317 DC-DC Converter Buck Step Down Board