Model COMP-WPCS-7415-FC-HCTS. Just because it's hot outside doesn't mean you can't work or enjoy your activities. With the Compcooler Waistpack Ice Cooling System you can work cooler, safer and stay focused for longer periods of time. This is the lightest and smallest cooling system COMPCOOLER has to offer. It combines a tubing-lined Hoodie Cooling T-shirt with a liquid cooling system housed in a waistpack to form a self-contained and convenient thermal regulation device. Available in sizes XS/S, M/L, XL/2XL, 3XL/4XL, the vest is a highly engineered stretchable garment that weighs a mere 0.5KG (1.1 lbs.), dry weight. The liquid cooling system is contained in a waistpack that weighs 1.5KG (3.3 lbs.), dry weight. It includes a 1.5-liter removable water/ice bladder, miniature circulation pump, 7.4V 2200mAh rechargeable battery, and flow control switch panel. When operating, it's audible output is 45dBA. Cooling energy is provided by removing the bladder from the system, filling it with water and placing it in a freezer. Once frozen, the bladder is easily re-attached to the system, and with a charged battery pack, Users turn the switch ‘On' and the pump circulates cold water in a continuous loop between the bladder and vest. 3 settings for regulating coolant flow lets the User minimize or maximize their ice energy. Low flow produces less cooling and conserves ice. High flow produces more cooling for a shorter period.Depending on ambient temperatures and workload, Users can expect a cooling duration anywhere from 1 to 2 hours with a fully frozen bladder. The battery can last up to 10 hours. Additional bladders and battery packs can be purchased for prolonged cooling.