Check the listing for details. Vaddio EasyUSB PRO MIC I/O - 998-8520-000 Interface 4-Ch. Condition: Used, Made in United States. Listed at 39.99 USD. The Vaddio EasyUSB PRO MIC I/O - 998-8520-000 Interface 4-Ch is a video conferencing device manufactured by Vaddio in the United States. This product offers high-definition video capabilities, making it ideal for business meetings and teleconferences. With its easy-to-use interface and 4-channel input, the Vaddio EasyUSB PRO MIC I/O provides a seamless and professional communication experience for users in various industries.