The compressor keeps fully what it promises - small, powerful, smooth-running! My car tires were inflated to 2.8 bar within 2-3 min. Under load. This is a peak. The power consumption is measured at 12V 7.8 A. Since the compressor has only one 12V cigar connector can use a 220V / 12V converter with at least 100 watts of power at 12 V at 220V. Cheap 220V / 12V transformer with less power are not enough! Turn the connector to the valve connection I personally find better than the always outgoing "snap connections". With a half turn is the tube in 0.5 sec. Detached from Ventiel and escapes only the air from the pressurized hose. Conclusion: Fully recommended !!!