Huan Tags use a version of Bluetooth called Bluetooth Low Energy (BLE). Bluetooth Low Energy was designed from the ground up to have an extremely low energy footprint and conserve battery life. 

The Bluetooth Low Energy radio inside your Huan Tag uses very low power emission standard, about 100 times weaker than the Apple AirPods, and 1000 times less than our cellphones. In addition, Huan Tags emit signals only periodically, greatly reducing both energy usage and the amount of radio transmissions.

Resources:

Are Wearables Safe?
Is Bluetooth Dangerous? No. No it isn’t.
CDC: Wearable Computers and Wearable Technology
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