No, kegg does not transmit signals during the reading.
kegg connects with the user’s phone’s low energy bluetooth. When prompted to start a reading, kegg is recognized by the app via the phone’s bluetooth. The user selects in the app that they are ready to insert their kegg. At this time, the signal is turned off. When the reading is complete, the user is prompted to remove their kegg and the reading’s data is sent through the antenna in kegg’s tail to the app via the phone’s bluetooth.