Measure fish day and night! The NRG Bump Board provides easy measuring with its glowing technology. Wally Marshall, pioneer of crappie fishing and Mr. Crappie® products, devised the light-up tool with ease and efficiency in mind. Measuring fish up to 20", the board is perfect for the everyday fisherman. There is no need to worry about wasting energy, with just 2 AAA batteries the three minute auto shutoff will prolong the batteries lifespan without worries of constantly changing them out.