Siemens Rolm Optiset E Basic Phone (Grey/Refurbished)Siemens designed the optiset E Basic telephone with today's corporate knowledge workers in mind, although its combination of low cost and flexibility makes it perfect for many other applications, such as hospitals and student dormitories. The optiset E Basic features eight keys with LEDs and supports up to four extensions. It includes a bay for attaching an easy add option module, two keys for volume control and one way speaker for hands free