Marathon's Multi-Purpose Clipboard features stopwatch, calculator, timer and clock functions. Ideal for monitoring lab work or making on-the-go calculations, this clipboard offers various tools all-in-one location. Accommodates standard 8.5 x 11 paper and includes built-in paper guide to keep sheets neatly aligned. Stopwatch feature allows single-event, pause and cumulative split timing. Clock mode displays the time and day of the week and features an extra loud alarm. 1.5V solar cell battery included.