The Cateye Velo Wireless+ packs a punch with a programmable odometer, menu screen and backlight with night mode. It installs easily on almost any bike, including 27.5 and 29'ers.Battery: 1, CR2032 Lithium Metal, 3(V), 0.735(Wh), 0.3g, IncludedComputer functions: current/ average/ maximum speed, trip distance, total distance, elapsed time, clock, calorie consumptionAnalog wireless computerPace arrowSimple tire sizeAuto start / stopProgrammable odometerMenu screen to change settingBattery indicatorBacklight with Night ModeIncludes zip tie bracketItem SpecificationsANT CompatibilityNoBluetooth CompatibilityNoCadenceNoColor ScreenNoColorBlackGPS EnabledNoHeart RateNoRechargeable BatteryNoTouchscreenNoWIFINoWirelessYes CatEye Velo Wireless + Bike Computer Bike Computers UPC: 725012038147