Features: brand new and high quality Function: There are 39 timing rule in 7 categories, including single/ multiple count down, reward, for time limit, delay, seconds, and forward timing. Settings: Different timing parameters can be set on the left and right sides. During race, the timing parameters of both sides can be changed. Large Button: Feel good, quick response, and convenient control, more suitable for fast chess. Keep Parameters: Power back on after power off, you can keep rule and parameters of race before power off. for DC 3V power supply (two No. 5 batteries are not included). Presets Rule Printed On The Back: Easy to use 39 presets rule, ready-to-use; The default value can be changed and saved inside for repeated use. Specifications: Material: ABS Color: As The Picture Shows Package Weight: approx.500g Size: approx.19.7x12.6x5.8cm/7.75x4.96x2.28in (More Size Details, Please See Photo.) Package Includes: 1Pc x Chess Clock note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!