Stopwatch very easy to use: * 3 Buttons from left to right is: Button C / Button A / Button B* Press Button A switch Mode to Stopwatch Mode: 1. Press B to Start/Stop stopwatch (when counting, press B to stop stopwatch; press B again will start stopwatch from last stop time...etc) 2. When counting, press C will display split time, stopwatch keep counting at the same time, press C again will return to counting stopwatch display 3. When stopping, press C will reset stopwatch to 0:00 00Description:Model:PS-528* 1/100 second Stopwatch Function, centisecond Level* Luxury Electroplated full metal Surface* 2 record data memory function* Stopwatch Max Count: 23 Hour 59 Minutes 59 Second* Alarm Function: Daily alarm with snooze* Clock Function: digital clock display, support 12-hour 24-hour system switching * Clock display: Hour/Minute/Second, Day of The Week, Month, Date* Stopwatch come with high-grade lanyard* High quality & excellent performance sport stopwatchDetail:* Dimensions: 74 * 60 * 15mm* Big Display Screen: 35.5 * 23.5mm* Material: High-Quality ABS* Battery: 3V Li Button battery (Battery Included)