The New iHold 4LP music on hold device for use with all corded or cordless 2-Line or 4-Line telephones, plays music and messages for up to Four on-hold callers

“All-In-One” music-on-hold devices for analog phones, these are the regular  1 to 4 line telephones 

The corded or cordless 1-Line, 2-Line or 4-Line telephones available on-line or in stores.