Head unit. The Flight Deck computer not only provides more information than conventional cycling computers, it features control keys integrated into both the right and left shift lever units for more convenient "Hands-on-bars" operation (sold seperately for specific models of Control Levers). With no control keys on the display head, Flight Deck is able to offer an extra-large screen w/ easy to read information. In addition to all of the normal cycling computer functions, Flight Deck gives you a graphic gear position display, gear size display after shifting, and Cadence display without a crank sensor. Four bike programing. Improved weatherproofing rated to withstand water immersion to a depth of 10 meters. Wireless speed sensor. Elapsed time and stopwatch functions. Easy wheel diameter registration. Control keys on bottom of Head Unit to allow for off-bike data viewing. Lap counter. Low battery indicator and battery saving auto shut-off function.