Super material: It is made of electronic accessories, nickel plating on surface(anti-oxidatioan), inner conductor: pure copper.it is long lasting and durable for you to use. Package including: 10 Pack of power supply Module. DC module, which consist of high-precision potentiometer (clockwise boost, counterclockwise buck), high frequency filter capacitor. it has current limiting, short circuit and over temperature protection. Even if the output is short circuit, it will not burn out the module and it is safer. Input and output: Wide voltage measuring /input range: DC 3.2-40V; Output voltage: 1.25-35V continuously adjustable.Output current: 0-3A. Working temperature: -40~+85 degrees. Feature: High efficiency and low ripple with power indicator. In addition to the current limiting and voltage regulation step-down function. High reliability, strong vibration resistance, good electromechanical performance. A wide range of applications: This module can be applied to the buck field whe