From PromoToMobile team:
Proximity Promoter is software for proximity advertising via Bluetooth connectivity (Bluetooth Marketing). Proximity Promoter 24x7 provides free transmission of any files (TXT, MP3, JPEG, 3GP, MP4, vCal, vCard) to any Bluetooth devices (mobile phones, smartphones, hand-held devices, communicators, laptops, mini-laptop computers) within coverage over Bluetooth. You can use "Proximity Promoter 24x7" for distributing your promo materials with no time constraints, i.e. 24 hours a day, 7 days a week, year around, without any additional expenses whatsoever. Does not require any special hardware - only a computer (PC, laptop) and a Bluetooth dongle. Absolutely any files can be distributed; however, keep in mind that the files must be viewable on your customers' Bluetooth devices. Both content transmitted and transmission via Bluetooth are totally free for both consumer and advertiser.