Callez Phone Headset with Noise Cancelling Microphone, Office Telephone Headsets for Cordless DECT Phones with 2.5mm Headphones Jack Compatible with Panasonic KX TGEA20 AT&T ML17929 Vtech RCA Uniden Black Color:Black Push Button Operation with instantaneous Color:Black & Yellow 2 pack Push Button Operation with instantaneous responseMAX MIN AVG Temperature MeasurementUser Calibration of Temperature and Restore Factory Setting2 temperature channel inputs: T1 & T2Differential Temperature Measurement (T1 T2)Overload & No thermocouple input indicatorComes with rubber holster that protects the meter from drop impact Where is a thermocouple thermometer used The electrical testers below accurately identify and capture circuit continuity and voltage measurements GXP 2000 (Version 1 Super lightweight headset design and adjustable headband make you focus on your calls and feel less pressure on your ears