1.CE certificate 2. Used in household,office building,parking lots ... lifting system,more stable and reliableChain-equalization systemSingle manual or e-lock release system,safe and relaibleWear- ... sure no oil leakageSolenoid valve has the emergency manual lock release functionOptional 24v control box, solenoid valve ... Acceptable , ODM Accepted , OEM AcceptedSafety/Quality Approvals 2 cars parking lift