Test Set, Connector Type ABN, Data Safe Monitor Yes, Dialing Method Pulse, Tone, Features (12) 16-Digit Number Storage, High Impedance Monitor, Mute Function, Pause Function, Last Number Redial, Three Audio Levels, Number of Digits 16, Testing Functions Hi-Z Monitoring, Alert Type Sound, Auto Power Off Yes, Battery Size 9V, Display Screen Type LED, Display Type Digital, Includes Hanger, Includes Batteries No, Maximum Operating Humidity 95 Percent, Maximum Operating Temperature 122 Degrees F