Test Set Connector Type ABN/PP Features Audible and Visual Mode Indicators Adjustable Ring Tones Digital Safe Line Monitor Talk and Monitor Keys Last Number Redial Mute Function Volume Control Two-Way Speakerphone IP Rating IP67 Number of Digits 32 Testing Functions Line Monitoring Line Polarity Indication Alert Type Light Sound Display Type Digital Manufacturer Warranty Length 3 yr Maximum Operating Temperature 140 Degrees F Minimum Operating Temperature -29 Degrees F