WTT-40-VoIP is a watertight IP telephones with armored handset cord. Features metal weather & dust proof metal keypad, spring loaded door, yellow enclosure for high visibility.Guardian’s watertight WTT-30-VoIP SIP-enabled VoIP telephone offers maximum efficiency under extreme environmental conditions. The sturdy thermoplastic resin enclosure protects the internal circuitry against wind blown dust, rain, corrosion,splashing and high pressure water with Type 4X & IP66 ratings these are ideal telephones for harsh conditions.