| 
       LCD  | 
    
       2.8" graphical 
      LCD  | 
  
    | 
       Resolution  | 
    
       132 x 
    64  | 
  
    | 
       LCD 
      Backlight  | 
    
       Yes  | 
  
    | 
       Line  | 
    
       3  | 
  
    | 
       PoE  | 
    
       Yes  | 
  
    | 
       GigE  | 
    
       Yes  | 
  
    | 
       Wall 
      Mounting  | 
    
       Yes  | 
  
    | 
       Foot 
      Stand  | 
    
       1adjustable 
      angle  | 
  
    | 
       USB Port (2.0 
      compliant)  | 
    
       x  | 
  
    | 
       Ethernet 
      Port  | 
    
       Dual-port Gigabit 
      Ethernet  | 
  
    | 
       Handset Port 
      (RJ-9)  | 
    
       Yes  | 
  
    | 
       Headset Port 
      (RJ-9)  | 
    
       Yes  | 
  
    | 
       External Yealink AC 
      Adapter (optional)  | 
    
       AC 100~240V input and DC 5V/600mA 
      output  | 
  
    | 
       Line 
      Key  | 
    
       3  | 
  
    | 
       Memory 
      Key  | 
    
       3  | 
  
    | 
       EXP50 Expansion 
      Module  | 
    
       X  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Yealink EXP40 
      Expansion Module   | 
    
       x  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Yealink EXP20 
      Expansion Module   | 
    
       x  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Yealink EHS36 
      Wireless Headset Adapter  | 
    
       x  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Yealink YHS32 
      Headset  | 
    
       Yes  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Yealink Bluetooth 
      Adapter BT40  | 
    
       x  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Yealink Wi-Fi 
      Adapter WF40  | 
    
       x  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       USB 
      Recording  | 
    
       x  | 
  
    | 
       3-way 
      Conferencing  | 
    
       Yes  | 
  
    | 
       HD 
      Voice  | 
    
       HD 
      Speaker  | 
  
    | 
       HD 
      Handset  | 
  
    | 
       Wide-band 
      Codecs  | 
    
       G.722, 
      Opus  | 
  
    | 
       Narrow-band 
      Codecs  | 
    
       G.711(A/), G.729AB, G.726, 
      iLBC  | 
  
    | 
       LCD 
      Type  | 
    
       Fixed  | 
  
    | 
       Operating 
      System  | 
    
       Linux  | 
  
    | 
       Built-in 
      Bluetooth  | 
    
       X  | 
  
    | 
       Built-in 
      Wi-Fi  | 
    
       X  | 
  
    | 
       USB 
      Headset  | 
    
       X  | 
  
    | 
       (Accessory, 
      purchased separately)   | 
  
    | 
       Camera  | 
    
       X  | 
  
    | 
       Video 
      Resolution  | 
    
       X  | 
  
    | 
       Video 
      Codecs  | 
    
       X  | 
  
    | 
       3-way Video 
      Conferencing  | 
    
       X  | 
  
    | 
       5-way video/audio 
      mixed conferencing  | 
    
       X  | 
  
    | 
       HDMI 
        | 
    
       X  |