Smart Wireless Temperature / Humidity Sensor Wide Range (-22 to 158 degrees) for Freezer Fridge Monitoring Pet Cage/Tank Monitoring Smartphone Alerts, Works with Alexa IFTTT, 2 Pack - Hub Included. 1,232. 100+ bought in past week. $5999. List: $69.99. Save $5.00 Details. FREE delivery Sun, Jun 11. Or fastest delivery Thu, Jun 8.