The Digiflo-L communicates with most popular GPS receivers. It features a seven segment red LED display, constant fuel flow rate, fuel used, fuel remaining, endurance (hours and minutes until fuel exhaustion), fuel to destination, fuel remaining upon reaching your destination, nautical miles per unit of fuel, low fuel warning (by time and volume) and add/full switch for one-touch fueling. Shadin's Digiflo-L is fully STC'd as a primary replacement on many Continental engine powered twin aircraft. TSO-C44a, Size: 3.125", diameter x 6.5"L, Weight: 14 oz., Accuracy ±1%