https://www.nordicsemi.com/Nordic-news/2017/04/Nordic-Bluetooth-low-energy-powered-designer-jewelry
Nordic Bluetooth LE-powered jewelry doubles as personal safety device in emergency situations -...
'IVY' from Smartfuture employs Nordic's nRF52832 SoC to allow the user to trigger a smartphone alarm, or notify a 'guardian' in the event their personal safety...
personal safety device