Heatstroke Prevention Watch Canary Plus 2025 Model An alarm sounds when the core body temperature is around 38°C. This product operates continuously for 5 months after activation and is designed for one season of use. Used for a construction site part-time job, the switch was turned on June 10th. It was used for 5 days and then disinfected with alcohol wipes and stored. Since it's a 5-month usage period, there are still 3 months of usage remaining. It is being offered at a low price because the switch is already on.