A. These fun handheld games help improve brain skills and hand-eye coordination. Volume is adjustable and can be muted entirely. Requires 3x AAA batteries (not included). B. The Flash electronic games offer a suitable amount of challenge for most people while developing hand-eye coordination for kids and adults—not too easy or too hard. C. You never have to stop the game to change a few batteries. The flashing cube is fully rechargeable! D. It offers a collection of one- and two-player games, complete with buzzing, beeping, exciting music, and voice-guided instructions and feedback from Mission Control. Includes the option to adjust the volume or mute it altogether. E. Size: 2.95 x 2.95 inch. A gift to be enjoyed by all ages for portable fun in any setting. F. Specification: Material: ABS; Color: Red, Black; Size: 7.5 x 7.5 x 7.5 cm; Weight: 230 g; Powered by: 3 AA Battery (Not Include). G. Package Include: 1x LED Flashing Cubes.