VEVOR Automotive Smoke Machine Leak Detector, EVAP Smoke Machine Leak Tester with Built-in Air Pump, Pressure Gauge & Flow Meter, Dual-Mode Diagnostic Leak Detector for Vacuum, Fuel, Pipeline Testing

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Unfortunately, the product information does not explicitly mention whether the Happybuy smoke machine has an automatic shut-off feature for safety.

The product information does not explicitly mention whether the Happybuy leak detector can detect leaks in a vehicle's air conditioning system.

Unfortunately, the product information does not mention anything about refilling smoke fluid.

While the product information does not explicitly mention suitability for small enclosed spaces, the smoke mode and compact size of 10.7" x 6.9" x 7.8" may make it appropriate for such applications. Customers mostly use it for detecting leaks in automotive systems.