Once power is applied to the sonde, internally or externally, users can awaken their sondes from Sleep state using any of several methods. Primarily, users activate EXO sondes and the Bluetooth connections via a magnetic switch installed in sonde’s electronics compartment. The sonde will automatically disable the connection and go to sleep once it has not received a Bluetooth signal for 5 minutes or a signal from the topside connector for 30 seconds. In order to activate their sondes, users should keep a magnet with them when setting up and deploying sondes. For more information on sonde states and LEDs, please see Section 2.5.