The Konexx Konference allows you to connect analog conference call units or direct-connect speakerphones to virtually any digital phone system. By interfacing with the telephone handset, this product lets you avoid the cost of installing dedicated analog lines. PRODUCT FEATURES: Works with virtually any conference unit or direct connect speakerphone; Four-position switch makes Konference compatible with virtually any digital phone system; Eliminate costly dedicated analog line installations and communication adapters; Powered by supplied AC adapter.