... and corrosion, IP68.3.High quality tempered glass with excellent light transmittance.4.Comply with Ex, ib, IIC, T4, IEC60079-11 ... stages Click-type switch high output,working output,and flashing light.7.Constant current make sure of brightness stability8.Lithium batteries ... be provided to our customer by our well-trained and professional engineers and staffs.5.Special discount and protection of sales ...