Knog N.E.R.D. 12-Function Cycling Computers. Functions include Current Speed; 12/24 hour clock; Trip Distance; Average Speed; Maximum Speed; Relative Speed Gauge (output as a bar graph of current vs average speed); Total Ride Time; Odometer; Scanning (displays all functions in a looped sequence); Low Battery Indicator; Multi-Bike Selection (accumulated speed and distance data for 2 different bikes can be stored); Distance Per Day; Display BacklightAll N.E.R.D. computers are wireless and coded to prevent interference and crosstalkAnimated rolling display with touch screen funtionalitySilicon tool-less attachment for transmitter and main unitMain unit head will attach to handlebar or stem with reorientation of N.E.R.D. unit100% waterproofDisplays in either metric or english unitsTransmitter uses one LR44 1.5V battery, head uses one CR2032 batteryTransmitter weighs 39 grams, N.E.R.D. head weighs 45 gramsItem SpecificationsColorRedWirelessYesHeart RateNoGPS-EnabledNoCadenceNo