Siemens OptiPoint 69915 Acoustic Adapter (Refurbished)Allows connection of an external loudspeaker and microphone, headset or additional optical acoustic indicator to your existing OptiPoint telephone Key Features: Mnfr. Part #: 69915 S30817 K7110 B508 9 Siemens OptiPoint Acoustic Adapter 2 x RJ45 ports 1 x RJ25 port Condition: Refurbished Compatible with the following telephone models: OptiPoint Basic OptiPoint Standard OptiPoint Advance OptiPoint 600 Office OptiPoint 410 OptiPoint 420 Standard