Simply turn the timer so that the side with the number faces up and the timer starts counting right away. A timer with simple cube design in 3 colors make it a perfect home decoration. Each cube timer has various time sets suitable for many uses such as exercising, studying, cooking and taking a nap. The alarm volume can be adjusted to high, low and off by flicking the switch. Requires 2 AAA batteries to use. (Batteries not included). The weight inside causes the timer to rattle. It does not mean that the item is defective. The red light blinks when the timer is in use. Pre-set tim: 15, 20, 30, 60 min.