Nako Na-617a User Manual Here

While the timer is paused, press to reset the digits to zero. Press M to return to the time display. 4. Specifications & Maintenance Power Source One LR1130 (or AG10) button cell battery Mounting Self-adhesive double-sided tape and adjustable stand Display

: Press the S button to shift focus over to the minute segment. Tap the D button until your target minute is achieved. Nako Na-617a User Manual

: Requires specialized button batteries (AG10), though these are usually included at purchase. While the timer is paused, press to reset the digits to zero