"Avaya J159 700512394 48 Key Self-Labeling Gigabit VoIP Telephone with Dual Color Screens, Full Duplex Speakerphone and Wide-band Audio Support. Power Supply Not Included Features - 2.8"" (320x240 Pixel) Color Primary Display - 2.3"" (160x240 Pixel) Color Secondary Display - 24 Self-Labeling Programmable Keys on the Primary Display (6 Pages of 4 Keys) - 24 Self-Labeling Programmable Keys on the Secondary Display (4 Pages of 6 Keys) - Red and Green Line Status LEDs - 4 Context Sensitive Soft Keys - 11 Fixed Feature Keys - 4 Way Navigation Key - Message Waiting Lamp - Full Duplex Speakerphone - Dual Position Base - RJ9 Headset Jack with Electronic Hook Switch (EHS) Support - Dual Gigabit Ethernet (10/100/1000) Network Ports - 802.3af (Class 1) Power Over Ethernet Compatible - Supports Optional WiFi 5 / Bluetooth Module - Can Be Powered Via PoE or Local DC Power Supply - Supports up to 3 JBM24 Key Expansion Modules - Supports up to 3 JEM24 Key Expansion Modules Compatibility - *******Compatible Add-Ons******* - Avaya J159 Wall Mount Adapter (700513631) - Avaya J100 WiFi 5 (802.3ac) and Bluetooth Adapter (700512402) - Avaya SPPOE-1A Single Port PoE Injector (700500725) - Avaya J100 Series 5V Local DC Adapter (700451230, 700512377) - *******Compatible Systems******* - Avaya Aura Systems with Release 6.3 FP4 or Higher Software - Avaya IP Office Systems with Release 11.0 or Higher Software (IP500v2) Other Information - Power Supply Not Included - PoE Requirement Increases to Class 2 with use of JBM24 or JEM24 - 5V Local DC Adapter Required with use of 2 JBM24 or JEM24 Modules - Bluetooth Not Available on IP Office "