DESC: The Model 2­9450D by GE Thomson is a 4-line by 16-station (4x16) electronic key telephone system that comes with speakerphone Do Not Disturb 16 Number Memory Dialer and all-station paging on every phone. With this system you can move into a multi-line office environment with maximum economy since the system doesn't use a key service unit (KSU). This means you don't need extra equipment hanging in your closet.