PQ-121 is the latest version of the self serivce car wash machine series and represents a new generation of self-service car wash machines developed by Risense to meet customer needs for convenient management of equipment clusters (with a large number of installed units). Its key feature is the ability to centrally manage all devices through a single management interface while achieving truly unattended operation. Beyond enabling self-service washing, payments can be completed directly through the machine without manual intervention. It stands as a powerful representative of small self-service car wash equipment on the market today, truly a feature-rich, terminal-grade device.