Ivation Bluetooth Water Thermometer for Bathtub, Pool & Hot Tub This Bluetooth Thermometer Continuously Measures Water Temperatures in Selectable Celsius or Fahrenheit Water Thermometer Records Temps with Time/Date Stamp; Alerts You When Water Hits User-Set Temp Wireless Thermometer Stores Daily Min/Max Temps & Recorded Min/Max Temps for Easy Reference Smart Thermometer Pairs to iPhone, Android, or any device Using Bluetooth 4.0 Low Energy Pool Thermometer Auto-Pairs When Mobile Device Gets Back in Range; Runs on 2 AAA Batteries (Included)