Traditional wearable thermal control devices use bulky and noisy components. New advancements such as the small electrohydrodynamic pump and soft tubes offer a promising avenue for such devices. However, they require real-time flow-rate monitoring, requiring additional equipment. Now, a team of researchers has developed a novel device that uses self-sensing technology for flow-rate monitoring, resulting in a compact personal thermal control device, marking a significant step in wearable device research.