Features: Adjustable Constant Current Electronic Load with Industrial Durability Precisely regulates DC3.7-13V voltages and 0.15A-3A current for power testing. Features thermal controlled fan activation at 40°C and continuous 15W discharge capacity (3A@5V or 1A@13V) for stable performances. for electronics engineers, enthusiasts, and lab technicians testing power supplies, battery packs, or USB powereds devices. Perfect for optimizing charging systems in workshops, verifying circuit stability in labs, or troubleshooting portable electronics at home. Engineered with plastic housing and extended life cooling fan, this USB load tester ensures accurate measurements through prolonged industrial operations. Specifications: Materials: Plastic Size:68x29x23mm Model: 18W, 30W (optional) Input voltages ranges: 3.7V~13V Input current ranges: 0.15A~3A, knob adjustment Input interfaces: USB/Type-c interfaces, or selfsoldering Fan heating methods: all-aluminum fan heating plate + intelligent temperature control fan Package Includes: 1PC USB Load Testers note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.