Test Set, Adapters Included ABN, Connector Type ABN, Data Safe Monitor Yes, Dialing Method Pulse, Tone, Features Audible Ringer for Callbacks, 20-Foot Drop Safe, Last Number Redial, Mute Function, IP Rating IP54, Number of Digits 23, Testing Functions Hi-Z Monitoring, Maximum Operating Humidity 95 Percent, Maximum Operating Temperature 140 Degrees F, Minimum Operating Temperature -4 Degrees F, Standards TNV-3, Waterproof Yes