Wireless safety temperature measurement.Wireless design, with no messy wires in the water, helps to keep the fish tank clean and safe. The smart thermometer can be applied to fresh water, tap water, salt water, sea water, and other different types of tanks, so that your pet has the most comfortable water temperature environment, under your careful care of healthy growth. Our Tank Thermometer Aquarium only needs to be taped to the outside of the fish tank to sense the water temperature through the probe on the back, cordless design, no cluttered wires in the water, providing a clean and safe environment for fish. Touch the button to display the temperature and the thermometer outside the aquarium goes to sleep after 5 seconds. The aquarium thermometer uses LED screen to display temperature, which not only has great advantage in visual range, but also has good color saturation, green and energy saving. It can avoid the problem of not being to read the value easily in strong or low light. Built-in 3V ultra-low power lithium manganese battery, no need to charge, long battery life, can be used for 5 years, energy saving. Touch to light up the screen, and 5 seconds later automatic screen, enter the standby mode, energy saving, and environmental protection. If you need to check the temperature multiple times, repeat the preceding steps. Classic square appearance, small and small, does not block the aquarium viewing space, as thin as 0.47inch, closely fitting the aquarium. There is no need to put it in the water. Just tear off the PVC adhesive paper on the back and directly below the water level on the outer wall of the aquarium. Colour:White Material:ABS Package Contents: 2 * Aquarium Thermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.