This fish finder is worn on your wrist and doubles as a working wristwatch, complete with time and date, unlike other sonar sensors that are handheld or affixed to a boat. It operates in a wide 75' remote radius, transmitting real-time views of fish to the 1 1/4 LCD display. The sensor reads depth to 120' with a wide 90° sonar beam. Includes display backlighting and a pulse-lit advanced sensor for night fishing. All controls are easily commanded from the waterproof wrist unit. Remote sensor runs 500 continuous hours, and automatically shuts off after removal from water. With instruction manual and remote sensor. Sensor is ABS plastic. Battery included. 2 H x 2 W x 2 3/4 D. (1 oz.).