the author of this app says:
This application uses Bluetooth wireless technology to enable you to exchange information with analogous devices. When a similar device using BuZZone appears within a 30 meter distance of you, your BuZZone will receive the business profile of the other user. If it matches your preset search criteria, it will notify you about that person. You can immediately view the business profile of another PDA owner and make contact by sending text or voice messages. You can control the access to your profile and exchange audio messages.
- WIDCOMM Bluetooth drivers