... abrasion andcorrosion, IP68.3.High quality tempered glass with excellent light transmittance.4.Comply with Ex, ib, IIC, T4, IEC60079 ... .5.Designed with advanced Optical Principles, making visual distance up to 200m.6.Three stages Click-type switch high output ... ,working output,and flashing light.7.Constant current make sure of brightness stability8.Lithium batteries ...