3 in 1 Digital Clock, Stopwatch, Thermometer 6 Digit LED Seven Segment Display Electronic Circuit Kit : MXA073 This item is only the board; there are no battery holder and AC adapter in the package. Here is a Digital Clock, Stop Watch, Count-Down Timer and Thermometer all in one package. The time and temperature displays may be set to alternate at user selectable intervals. The MXA073 will find application in public displays, schools, sports clubs and industry. In sports applications, the MXA073 is also fitted with high current, multiplexed drivers to driver external 7 segment displays like the MXA004 units. Correct time is maintained during blackouts by a back-up battery feature. Technical information: Power supply : 12VDC./ 150mA. (max), Battery Back-up: 0.5mA 3V. Timing Modes: Time of day, Stop Watch, Count Down Timer (up to 23:59.59 Hours). Temperature Range: 0 C to 99.9 C External Display Driver : Multiplexed up to MXA004 (9"), Output Relay Capacity: 1A PCB dimensions: 4.70"x3.90"x0.55" (120mm x 110mm x 13mm)