This set includes 2 ARM simulation debuggers with SWD interface. Each debugger features a simple 4-line SWD connection (VCC, SWDIO, SWCLK, GND) for fast downloading and simulation. It is compatible with V8 simulators and provides the same functions. A universal Micro-USB port allows easy connection with common Android cables. The 3.3V power output supplies up to 300mA to power the target board during debugging. Built-in safety includes a self-recovery fuse and ESD protection for stable operation. Firmware is reliable with automatic updates, minimizing risk of damage. The compact U-disk size makes it easy to carry. Each debugger is a 2-in-1 tool combining programming and simulation for ARM-based MCUs (such as STM32 series). It supports programming FLASH ROM, EEPROM, AFR, and more. Debugging features include full-speed running, single-step, breakpoint debugging, and real-time monitoring of IO status and variables. With USB 2.0 and SWD interface, downloading and simulation are fast and responsive. Specifications: Color as shown; material: plastic + metal. Package includes 2 emulation debuggers. Note: slight color variations may occur due to lighting and screen differences; measurements may have a tolerance of +/- 1–3 cm.