EXTECH 365515-BK Stopwatch/Clock with Backlit Display

Features
1/100th second resolution for 30 minutes
1 second resolution up to 24 hours
12 or 24 hour clock format
Timing capacity: 23 hrs, 59 mins, and 59.99 secs
Basic accuracy: ±3 seconds/day
Calendar displays day, month and date
Programmable alarm and hourly chime setting
Backlight turns off after 4 seconds
Water resistant housing and neckstrap
Dimensions: 2.3x2.8x0.5" (5x70x15mm)
Weight: 2oz (50g)

Complete with LR44 battery and 39" (1m) snap-away neckstrap

Datasheet

Manual