LPS-1 Hand-Held Depth Finder - Nautical Yellow--The LPS-1 is simple to use. Just put it in the water, point and push the "ON" button. The depth or distance is digitally displayed for 10 seconds before automatically shutting off, with no risk of battery drain. For fishing, simply touch it to the surface of the water. For ice fishing, the signal will shoot through clear. Waterproof down to 150".