This dehumidifier from Hydrosorbent comes along with an inbuilt recharge indicator. The indicator is initially orange in coloration, nevertheless it turns alone distinct when it demands a reactivation. Additionally, this item doesn’t need any power supply to operate, which suggests it could work and not using a battery or cord. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/