Test Set, Adapters Included ABN, Connector Type ABN/PP, Data Safe Monitor Yes, Dialing Method Pulse, Tone, Features Caller ID with Call Waiting, Data Lockout Protection, DSL/POTS Filtering, Last Number Redial, Low Battery Indication, Mute Function, Polarity Function, Speed Dial Memory, Two-Way Speakerphone, IP Rating IP64, Number of Digits 23, Testing Functions Line Polarity Indication, Milliamp Detection, Alert Type Light, Sound, Backlit Digital Display Yes, Battery Chemistry Alkaline