Perfect for ponds, tanks, and any other fluid based water applications. <br><br> Floating pool and spa thermometer with LCD display<br> Eight channel selectable switch<br> Line of sight wireless transmission (in open air): 300 feet under ideal conditions, 100 feet under most conditions.<br> Frequency: 433 MHz<br> Update Rate: 60 seconds.<br> <b>Power Consumption:</b><br> Remote sensor : 4 x AAA 1.5V Alkaline or Lithium batteries (not included)<br> Solar powered with battery back up<br> <b>Dimensions:</b><br> Pool Float Thermometer transmitter (WS-PFT120) Dimensions (LxWxH): 8.5" x 4.2" x 3.7"<br>