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Industrial Control & WiFi Smart Relays | DAQUAN Electric - Since 1996
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https://www.macrumors.com/2014/06/10/ringly-smart-ring/
'Ringly' Smart Ring Relays iPhone Notifications Over Bluetooth - MacRumors
Ringly, a new iPhone-connected smart ring designed for women, uses Bluetooth LE to connect to a phone, lighting up and buzzing to alert users of...
smart ringrelaysiphonenotificationsbluetooth