The most versatile handheld sonar system ever produced! not only will this this portable depth finder give you instant depth readings, from 2.5 to 300 feet, in 1/10th precision, but at the press of a button the display will give Real time temperature (water or air) and fish readings. The LCD display is back-lit for nighttime viewing and the unit is waterproof to 150ft. To use: place the transducer side of the unit in the water. Slide the activation button, and instant depth, fish and temperature readings will be displayed on the LCD. Includes: handheld sonar system, wrist strap, user’s guide. Requires 1 ‘9V’ batteries (not included)