Wireless Duct Temperature Sensor uses an NTC type thermistor with UL listed plenum cable to accurately measure temperatures in duct work, while maintaining a sealed environment. Can be easily installed and mounted for long term use. Use for supply, return and mixed air temperatures.
 
Thermistor Operating Range: -40°C to +150°C ( -40°F to +302°F )
Accuracy @ 25°C: +/- 1° C (±1.8°F @ 77°F)
User Calibrated Accuracy: +/- 0.25° C (±0.45°F @ 77°F)
Time Constant @ 25°C: 30 sec.
Lead Wire Length: 8 ft ( 96 in.)
Cable Rating: UL listed plenum cable
Weight:  0.7 oz.
Security: Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Battery Type: Replaceable Standard AA
Dimension: 2.0 in x 1.125 in x 0.875 in
Max Operating Temperature: -7°C to +60°C ( 20°F to +140°F )
Optimal Battery Operating Temperature (Coin Cell): +10°C to +50°C ( +50°F to +122°F )
Supply Voltage:  2.0 - 3.8 VDC
Battery Life: At 1-hour heartbeat setting, battery will last up to 4 years. **
Enclosure Material: ABS
Operating Frequency: 900 MHz Operating Frequency
Certifications: 
     Complies with Part 15 of the FCC Rules. (FCC ID: ZTL-G2SC1)
     Complies with Industry Canada standards. (IC: 9794A-G2SC1)
Device Range: Device Range Up to 1,200 ft. non-line-of-sight, wireless device range*
Security: Encrypt-RF® (Diffie-Hellman Key Exchange + AES-128 CBC)