The Guardian Model 401 is UL Listed and CSA Approved For Class I, Div. 1 & 2, Groups B, C and D.  The Guardian Model VR700 is CSA approved and UL Pending for Class I, Div. 2 Groups A-D, Class I, Zone 2, Gas Groups IIC.  The VR700 also has a 4X rating, making it ideal for use in offshore or corrosive atmospheres. EEx Telephone Fiber reinforced Tamper-proof keypad EEx desk phone also available Combined Beacon / Sounder EEx II 100db, multi-tone Powerful beacon EMC tested