Two Input Temperature Transmitter WiFi 802.11 B/G/N Communication Method Temp Range (F) -328 to 572 Degrees Temp Range (C) -200 to 300 Degrees Accuracy +/-1 Degrees F (+/-0.5 Degrees C) Power Source AA Lithium Battery Battery Life 3 yr. Features Enterprise Security PEAPv0 with EAP-MSCHAPv2 (PEAP) Height 4.25 In. Width 2.5 In. Depth 1.125 In. Wireless Range 2 Mile For Use With TempTrak Wireless Monitoring System Includes (2) Air Probes and Batteries