Function description:
1. DC 3V power supply (powered by two AA batteries).
2. It has 42 timing rules in 8 categories including single/multi-segment countdown, reward, time limit, delay, countdown, and positive timing.
3. Timing parameters can be modified for each timing rule. (Except for timing)
4. Different timing parameters can be set on the left and right sides.
5. During the game, the timing parameters of both sides can be modified.
6. Shut down and then turn on again, the rule parameters that were played before shutting down will be retained.

Product specifications:
1. Material: ABS
2. Batteries: AA batteries x 2 (delivered without batteries)
3. Screen size: 122 x 24mm
4. Product size: 161 x 100 x 62mm
5. Net weight: about 245g