Configuration instructions: 1. All-in-one unit: The welding has been completed, the refrigerant has been charged, and it can be cooled when it is turned on; it includes a thermostat, no shell, no water tank, and no water circulation system. 2. Product parameters: Model: ST19W Voltage: 12V/24V/48V Refrigerant: R134a Maximum cooling capacity: 360W/400W/455W (adjustable) Condensing unit size (outside unit): 300MM length X200MM width X155MM height ( A slight discrepancy in the data is not a reason for return or exchange! ) Scope of application: small chillers; small water circulation systems. User-supplied: DC power supply, water tank, water circulation system, etc.