Can count up to 24 hours with timing to 1/100 second for the first 30 minutes, then in 1 second intervals. With Start, Stop (Time Out), Resume or Reset functions and Cumulative Split Time function. Good for single event timing and events where cumulative split times are required. Small size makes it ideal for children to use. Battery included. Uses SR44 battery ESPO Code 52705. Supplied as 1 each of Red, Blue, Yellow and Black.