Innovative Telecom SX8800-2LPS  Music & Message On Hold Adapter with 256MB USB Flash Drive Player Superior sound quality with provided USB drive/ mp3 player or any other audio source Compatible with corded, cordless phones and caller ID, call waiting, 3 way calling, centrex lines and answering machines Compatible with all phone services from all phone companies plus cable, VOIP, MJ, Vonage & FIOS Provides audio test functions and customized configuration settings via simple slide switches 1 year parts & labor warranty