Overview: Only Need One (LR44) Button Cell Pi Pi Pi Pi Pi Pi Pi Pi Pi Pi Pi Pi 99'59" IIIustrative Stopwatch Operating Instruction One. Production use This production can enactment noon break time, study time, hair dressing time… & so on Two Porduction Function This production is be read display maximum countdown capacity of 99 minutes 59 seconds. Three. Use Means 1. Press M button to set desired minutes.2. Press S button to set disired seconds.3. Press START/STOP button once to start timer.4. Press M to show the S key to return the zero to reset at the same time 5. Beenactment time to count-down is " ZERO" second hour occurrence alert.6. Press RESET button to stop alarm Four. Batteries usr & barter 1. Replace battery when ever reading becomes dim amp;difficult to read.2. Usage button G13 type battery. 3. Open the battery door, & take out the old battery, & peg out the new battery plus or minus very put into, & press back the, nome posittion the battery door Specification: Dimensions: 65 X 65 X 13 mm Weight: