1. Multifunctional: countdown, seconds display, multi-segment timing, time limit, positive timing, delay function, and mute. 2. Power supply: Uses dry batteries (two or four AA batteries, not included) or USB power supply. The device requires an active power source to operate and does not have internal battery storage. 3. Widely used for chess games, including Chinese chess, international chess, and Go. 4. Easy to use: Allows independent adjustment of time settings for both players during gameplay, with separate base time and increment settings for left and right sides. 5. Large rocker switch: Provides tactile feedback, quick response, and intuitive control—ideal for fast-paced chess games. Type: Chess Clocks Model Number: Chess Digital Timer Power Options: - DC 3V (two or four AA batteries, not included) - USB power supply (requires external power source; no internal energy storage) Color: Black Material: ABS Dimensions: 197 x 126 x 58 mm Package Contents: - 1 x Chess Digital Timer - 1 x USB Cable