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Comparison chart of portable cooling devices including Jolt Bar, CoolMitt, Nice Rocc, and Ava Cooling with categories such as portability, temperature indicator, ready to use, duration, and price.

*A key feature of Jolt Bar is that it accurately measures the temperature of the surface which you actually are touching, rather than internal water or another system that is not in contact with your hands. The environment has a significant effect on the surface temperature, so measuring the water temperature inside the device is not an effective method.