Compact interval timer times one or two intervals between two seconds and 99 minutes. Built-in Stopwatch and Clock feature. Auto mode keeps repeating through intervals up to 99 repeats. Chime and vibration interval notification; alarm duration can be set for one, two, five, or nine seconds. Increased water resistance makes this ideal for outdoor actives where the timer may be exposed to moisture, such as rain. Sweat and impact resistant. Has a very loud beep, which makes it perfect for group classes or outdoor use. The beep can be made dimmer, or silenced altogether by using only the vibrate mode. Secure and Removable Belt-clip included. Size of a small pager. Powered by one AAA battery (not included); measures 2.25 by 1.75 by 0.5 inches (55mm X 44mm X 14mm).