... piston type,oil free, none air polluted, start with air, continuous working,powerful.auto start AS186 AC 220V Mini Air Compressor Features:1. Single Cylinder ... Piston Compressor With Air Tank.2. Multifunctional, low ... .8 KGCertificate: CE, GS, ETL, CETL, ROHS CE AS186 AC 220V Mini Air Compressor with air tank