12-Volt DC Extra Battery Pack for Master Airbrush TC-21 Compressor 12 Volt DC Battery Supply Pack Only Fits the Model TC-21 AirBrush-Depot 12 V DC Battery Powered Mini Airbrush Compressor Battery Charge Period: 2.5 Hours Battery Working Time: Continuous working time for about 1.5 hours after full charge Powered Mini Airbrush Compressor with 12V DC Battery Charger. (Airbrush Compressor NOT included)