Usage Tips:1.Digital Timer: 99 minutes Max, 59 seconds Countdown. Stopwatch & Digital Timer. Memory setting of previous timing. Press ST/SP to pause or start the timer. Comes with ON/OFF Switch. Powered by 1*AAA battery (battery not included).2.Loud Alarm: Ring the sound of "BiBi" lasts for 30s when the timer is count down to zero, and you could press the ST/SP to stop it.. Loud & clear sound but not deafening. The alarm sound can be heard from another room.3.Great Quality : STRONG MAGNETIC BACK, difficult to fall off, more magnetic than ruber magnet. LCD digital display allows easy read. Made as ABS, difficult to break. Small size and Light body make it Pocket Portable.4.Multi-functional: Extensively use in break time, cooking, beauty facial, gym, sport, set medicine time, meeting, classroom... Etc. It's also a good count up timer: Clear the time to "00:00", press ST/SP button and time will start to count up.5.Perfect Package: Include 12 pack timers (white, blue, pink, green ). Come with timer instruction manual.