Compact interval timer times one or two intervals between two seconds and 99 minutes. Built-in Stopwatch and Clock feature. Secure and Removable Belt-clip included. 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. Backlit LCD makes it easy to see in any light exposure. Weatherproof allowing for use in heavy continuous rain as well as extreme sweat and humid conditions. Please note - Cannot be submerged in water. Do not use in a pool. Size of a small pager. Built in rechargeable battery that will last for months on a single charge. Charging cable included. Fits all Gymboss Accessories, including the Gymboss Watchstrap.