The CP600/600E is designed for the collaborative workplace. The consistently paperless design is particularly suitable for mobile workers or environments. The base unit is optimized for single line usage. The Favourites menu allows the user to program important numbers or features wihtout the need to connect a Key Module. CP600E: Up to two connectable key modules with 12 buttons each satisfies the need of many free programmable keys. CP600: Up to four connectable key modules with 12 buttons each satisfies the need of many free programmable keys. The high resolution display of Key Modules shows the key label and additional information like status and action icons. The key module is highly recommended for multiline usage. It provides interactive line information as well as status information using the display and the three colour key LED. The CP600 is equipped with a new Bluetooth 4.1 function. Bluetooth headset are supported in HD audio quality. The new – Bluetooth Proximity – feature allows to automatically lock the phone when the headset or other Bluetooth device is removed from the phone range. The built-in NFC chip simplifies the Bluetooth pairing with compatible Smartphones.