WeatherHawk myBlue-T Bluetooth Temperature Sensor, Oval, White Bluetooth Link to Smartphones & Tablets via Free App Easy to Use, Compact Size, Long Range Waterproof & Shock Resistant up to 3 Meters Displays Temp in Fahrenheit or Celsius Supplied with 2 Lanyards: 5 cm and 30 cm Bluetooth Link to Smartphones & Tablets via Free App.Bluetooth range dependent on conditions. Easy to Use, Compact Size, Long Range up to 40 meters outside, 10 meters inside Wireless using the 2.4GHz ISM Bluetooth Band subject to interference and Waterproof & Shock Resistant up to 3 Meters Displays Temp in Fahrenheit or Celsius and Temp Range: -20 to 60 C or -4 to 140 F, Accuracy to +/-1 Celcius Supplied with 2 Lanyards: 5 cm and 30 cm and App can manage multiple temperature tags at once