3-in-1 Multipurpose Portable Professional Chess Clock Digital Chess Timer Game Timer

Features:
Large flexible button with better sense of press.
High quality of ABS plastic durable material shell.
Available for bonus delay mode.
Portable energy saving design.
Functions:
Basic: Set basic time.
Bonus：Set basic time and bonus time.
Delay：Set basic time, second reading times and time.
Positive Timing: Set basic time to be 0 for overall rationing system