I have the same problem with the xinjia-686. These instructions posted for another digital sports watch worked for me.
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I have the AW21312W, which has 4 buttons:
- Light (Top left)
- Mode (Bottom Left)
- Start/Stop (Top Right)
- Lap/Reset (Bottom right)
To turn the set alarm off, push buttons 3 and 4 at the same time, the
alarm icon should appear or disappear
To turn off the hourly
chime, press button 4. While holding it down, press button 2 and the
days of the week disappear. The chime is now off. If you want the chime,
press button 4 and hold while you press button 2. When all the days
show, the chime is on.