... features 2.1 Operation standard,GB3836.1-2000,GB3836.2-2000, GB3836.3-2000,GB3836.4-2000.2.2 Anti-explosion mark ,check details at ... our homepage 2.3 Operating voltage ,AC220V±15%,50Hz2.4 ... operating current , 50mA,≤0.2A. 2.5 frequency response ...