Detailed Product Description chess clock Features: - Available for Chess or I-go - Preset or revise the timing rules- Auto-counting of steps in match and auto-reading of second in I-go mode- Press the locking key, avoid the fault being made by touching the OPEN/CLOSE key- 3# (R20) Battery- Size: 194.0 x 130.0 x 55.0 mm - N.W.: 390.0 g