With easy-to-read LCD digital display for this thermometer, you can easily keep an eye on the temperature in your room and aquarium. It is suitable for desktop placing, metal surface sticking or wall hanging. Features: Automatically and simultaneously display indoor & 2 outdoor temperature. Max and min indoor and 2 outdoor temperature display with manual clearing of the max/min value. Temperature alert setting and automatic high/low temperature alarm function with temperature trend. Large LCD display, easy to read. Up to 2 outdoor transmiiters receivable (2 outdoor sensors are included). Temperature can be displayed in Celsius() or Fahrenheit(). With back stand, hanging hole and magnetic stick at back side, convenient to place or hang. Perfect digital thermometer for fish tank and aquarium. Note: Must first install thebattery of thermometerreceiver and theninstall thebattery oftransmitter. Specifications: Color: White Material: ABS Plastic Display: LCD Screen Screen Size: 53 * 60.6mm / 2.09 * 2.60in Indoor Temperature Range: 0 50 (32 122) Outdoor Temperature Range: -40 60 (-40 140) Testing Period: 10s Temperature Accuracy: 1 (1.8) Temperature Resolution: 0.1 (0.2) Thermometer Battery: 2 * 1.5V AAA Battery(NOT Included) Outdoor Transmitter Battery: 2 * 1.5V AA Batteries(NOT included) Transmitter Size: 38 * 105 * 35mm / 1.50 * 4.13 * 1.38in Thermometer Size: 98 * 85 * 22mm / 3.86 * 3.35 * 0.87in Transmitter Weight: 38g / 1.35oz Thermometer Weight: 96g / 3.39oz Package Size: 11.5 * 9.5 * 6cm / 4.53 * 3.74 * 2.36in Package Weight: 212g / 7.48oz Package List: 1 * Digital LCD Thermometer 2 * Wireless Outdoor Transmitter 1 * User Manual (English)