Multi protection power supply: acts as a regular power supply with builtin protections for overvoltage, overcurrent, over power, over temperature, and undervoltage. This helps protect your circuits and batteries during use. Portable USB voltage regulator: features user friendly interfaces and a compact, portable design, making it a handy companion for on the go troubleshooting and innovation. Constant current charging: includes a constant current function and can charge various small rechargeable batteries within a range of 0.6V to 30V, up to 15W. Suitable for a wide audience: ideal for electronics enthusiasts, engineers, and students. This device is designed for anyone involved in detailed electronic work or education. Use scenario: on the bench for testing and prototyping, powering small circuits and devices while developing projects. Use scenario: in the field for quick repairs and troubleshooting, providing portable power and charging capabilities where a larger power supply isn't available. Use scenario: in classrooms or labs for hands on learning, practice with voltage regulation, current control, and battery charging in a controlled, safe way.