Thermistors change resistance depending upon temperature. They are available in two resistance values.

Negative temperature coefficient (resistance falls as temperature increases).

Value: 4.7k

Response time: 1.2s 

Thermal time constant: 11s 

Operating temperature range:  zero power: -40°C to 125°C  maximum power: 0°C to 55°C

Dissipation factor: 7mW/°C 

Maximum dissipation: 500 mW 

Tolerance: ±5%