Designed for use in schools with two large colour-coded buttons and a large 15mm LCD screen, housed in a robust ABS casing. Timing to 1/100 second for the first hour, then in 1 second intervals. Measures up to 59 hours, 59 minutes and 59 seconds. Printed with 'School Stop Clock' as a theft deterrent. Battery included. Uses AA Batteries, ESPO code 111465.