A great new take on relativity. The numbers on this clock actually rotate with each passing second. The time is still easy to read, but it's more fun than just a regular, non-relative clock. Has snooze alarm and light. Operates on one AA battery (not included). Comes boxed with instructional booklet. Measures 4" in diameter with 2.25" face. Stand 2.5" tall. 1 year warranty.