I bought this about a year ago for work. I replaced the battery with a new one for the listing. Only the main unit and strap are included. Please check the official website for operating instructions (^^) Thank you. Solar-powered stopwatch ■Use for various sports such as track and field events at sports days ■Size Width 68 x Length 92 x Thickness 23mm ■Weight 83.5g ■Functions Alarm function, countdown timer function, temperature/humidity display, perceived temperature display Digital display up to 1/100 second, displays up to 9 hours 59 minutes 59 seconds, simple timing, cumulative timing, lap/split timing (with memory for 99 laps/30 laps), clock (12/24 hour switchable) and calendar display, alarm function, countdown timer function, temperature/humidity display, perceived temperature display ■Measurement range/display Up to 9 hours 59 minutes 59 seconds, digital up to 1/100 second ■Power supply Uses one CR2032 battery With solar auxiliary power supply