• The ring is made of engineering plastic, and has a square-shaped top. It contains a battery and an electronic chip, through which it is connected to the D’ring Android app on your smartphone or smartwatch.
  • At the click of a button on the side, the top of the ring springs up and becomes a weapon: the three edges on top, layered with thin blades, expose themselves.
  • Just a turn of the wrist can inflict an injury on the assailant’s hand, even in situations when the user’s hand is held firmly.
  • To shut it, the top has to be clamped down, until it clicks.
  • Double-pressing the button will activate the chip, which triggers the app to send a message to your emergency contacts, informing them of your location. (In future iterations, the alert may also be sent to nearby police stations or patrol vans.)
  • The ring can be recharged using a USB-2.0 cable.
  • For those worrying about privacy, D’ring operates solely on-device, according to the duo.