CS300 USB Communication Headsets - Koss Stereophones
Smartphone support + USB Port + Cable Yamaha x-max 300 xmax 400 2018 2019 2020 | eBay
300 second (5 minutes) USB recording module with 4 buttons | Electronics123
300 SERIES - Cactus Technologies
Series USB-300 | USB Wireless Receiver allow PCs to test any EnOcean enabled device using wireless technology. Applications in building commissioning and product installation trials. | Dwyer Instruments