• Perfect for a variety of board games, this digital watch is perfect for countdowns, counting, bonuses, chess and other games that require delay time • Big Button High Quality ABS Plastic Durable Material, Large Flexible Button with Pressure • Lightweight and portable, lightweight and small size fits easily into most bags and can be carried to clubs or tournament events • Reach mode and delay mode Portable energy saving design can be used in rear-mode and delay mode • Scroll down to the Japanese instruction manual. Scroll down to the detailed page to read the Japanese instruction manual