These comprise of a small box attached to a lanyard, through which an antenna is threaded. On the front facing side, a red button is exposed to activate a signal to the main receiver.

These devices have several uses:

  • They can be worn around the user’s neck and can transmit a signal if the user is in distress. To activate the signal, the user just needs to press the button located on the front of the device.
  • Or they may be used as a tracking device for stolen items.