Fangrui Product Details 1. Dt02 Quartz Chess Clock Chess And Go Timer 2. With Timing Start Button Type Quartz Electronic Clock Structure, Timing Operation Intuitive, Convenient, The Daily Error Is Not More Than 1 Second 3. The Tail Of The Minute Hand Is Designed To Curved Shape, The Small Red Flag Free Fall When The Minute For The Scale Of The Alignment For Zero 4. The Base Is Enlarged, From The Top To The Bottom Of The Continuous Increase, Placed On The Desktop More Stable 5. Maintenance: Should Be Prevented From Contact With Corrosive Substances, Avoid Exposure To The Sun, Rain, Falling And Close To Strong Magnetic 6. Power Supply: 1 Aa Battery Power Supply (not Included) 7. Size: About 18 X 11.5 X 6.5cm 8. Weight: About 350g 9. Usage: 10. Timing Button Operation Method: Press The Left Button, The Left Clock To Stop Timing, The Right Clock To Start Timing. Conversely, Press The Right Button, The Right Side Of The Clock To Stop Timing, The Left Side Of The Clock To Start Timing, Both Sides Of The Button At The Same Time Press Halfway (that Is, The Two Sides Of The Button In The Same Horizontal Position), Both Clocks Are In The Stop Timing State 11. Second Hand Zero Adjustment: By Alternately Operating Both Buttons, The Second Hand Of The Two Clocks Can Be Adjusted In Turn At 12 Position (zero), Respectively, In Accordance With The Direction Of The Arrow On The Back Of The Clock Dial Needle Hole Dial The Hour Hand, Minute Hand To 12 Position. Timing, The Minute Hand Zero Position To Distinguish The Minute Hand To Push The Whole Point To Determine The Marker Small Red Flag Up To The Right To Reach The 12 Position, To The Small Red Flag Free Fall Instant Minute For The Alignment Of The Scale For The Zero Position