the Lord of Tools 8Pcs LM317 DC to Buck Converter Adjustable Regulator Power Supply Modules with Connector Female Male

[Type]: LM317 adjustable power supply buck module DC-DC converter. [Voltage ]: Adjustable output voltage range is 1.2 - 37V, and input voltage is 4.2 - 40V. [Current]: Power supply current is 1.5-2.2A. [Plug Size]: The inner diameter of male plug is 5.5mm, and the inner diameter of female plug is 2mm. [No Short Circuit Protection]: If you need short-circuit protection, please connect a self-recovery fuse in series with the input terminal.