Digital clock/thermometer with illuminating back light can be used in aquariums, reptile habitats, and green houses. Gives accurate measurements of aquarium water or room temperature in F or C. The Little Time or Temp is safe for both salt and freshwater, and attaches to any surface. Comes with a 3' probe cord and suction cup for easy placement. Includes a heavy duty battery (AAA) with a 2 year life. Size: 4 1/2" l x 1" w x 3/4" h