NTC thermister is a transducer which converts heat energy into electrical energy and its resistance decreases when temperature increases.
 
Specifications
Resistance at 25 degrees C
10K +- 1%
Thermal cooling time constant 
<= (in air) 20 seconds
Thermistor temperature range
-55 °C to 125 °C
Dimensions 
3 x 1 x 1cms 
Weight 
5 grams