Cap Tech U Badge for DEF CON 31

Radio and Wi-Fi Detection Device

This DEF CON 31 exclusive, limited edition “badge” was designed by our very own Cap Tech U engineering students! It detects radio and Wi-Fi signals from electronic sources like laptops, smartphones, radios, and other devices! When you get close to anything with a radio or Wi-Fi connection or signal, the badge’s built-in speaker will make a static, buzzing noise! 

Many people are unaware of the different hidden electronic signals that can be found in our everyday life. Everything from thermostats to cell phones to slot machines can contain a transmitter or use a radio or Wi-Fi signal. 

Did you know...that everyday items can have a radio or Wi-Fi transmitter inside? 

Can you guess...which equipment at DEF CON has these transmitters? 

Use this badge to find out! 

To read more about Cap Tech U at DEF CON 31, visit our blog.

Learn More

Our Badge Sponsors

Clarity Cyber Logo
APS Global Logo


We would like to acknowledge and thank the following DEF CON 31 Badge project contributors. Through their generous support, this project was made possible.

Clarity Cyber APS Global LLC
Designers (Faculty) (Students)
Dr. Charles Conner Elijah Emory
Dr. Rick Hansen Michael Prebble


Manufacturers (Students)  
Silas Charles Stoil Avramov
Holy Negussie Elijah Emory
Michael Prebble Omar Brown
Josine Mamno Christian Michael
Bri'Yanna Cobb  

 Badge PCBs manufactured by PCBway and JLCPCB

Original Design

Paul Beaumont created the original circuit schematic that was utilized in creating our design and PCB.

His design can be found by visiting his site.

Cybersecurity and Engineering Programs at Cap Tech U

At Capitol Technology University, we offer degree programs in cyber and information security such as cybersecurity and cyber analytics, as well as an array of engineering degrees to ensure our students are prepared to enter the industry in these growing areas of study. You will practice hands-on technical skills in our laboratories and learn from expert faculty who have experience in the field, giving you important insight into the real workplace environment. You will also benefit from our partnerships with leading tech industries around the world – all who are seeking cyber professionals like YOU to fill top positions in their companies!

For more information, visit our website