The totwoo smart chip inside the jewelry uses advanced international low-power Bluetooth (BLE) technology, which emits far less radiation than a mobile signal and a regular Bluetooth earphone and can be ignored. The effective working distance between the phone and the bound jewelry is about 3 meters. If the distance is exceeded, the Bluetooth connection will be disconnected. However, even within the distance, it still depends on the specific environmental conditions, such as if there are too many people or if there is wall interference, the Bluetooth connection may also be disconnected. If the Bluetooth connection is disconnected, it will affect the use of product functions, but the app has an automatic Bluetooth reconnection function.