【Accurate Ultrasound Module】 The ultrasound module in this soldering kit possesses a stable measuring range, capable of measuring distances up to 4 meters. Its special PCB and STC microcontroller enhance responsiveness and accuracy, allowing for use without the need for programming. 【Rich usage scenarios】 This soldering practice kit boasts the ability to measure distance, as well as set an alarm distance. With two power supply modes: DC power supply and AA battery, it is tailored to meet a diverse range of use scenarios. [Practical Electronic Soldering Practice Kit] This kit is designed not only for soldering practice for electronic DIY enthusiasts, but also for hands-on teaching and fabrication courses. It is suitable for all electronic hobbyists and individuals seeking to learn soldering skills. [Detailed installation instructions] This electronic kit requires self-assembly through soldering, but fret not. We provide detailed installation instructions for your convenience. These instructions are clearly labeled and printed on the PCB, and we also offer detailed instructions in both paper and electronic format.