diff --git a/docs/devices.md b/docs/devices.md
index 372bd2e6..6c2b5d61 100644
--- a/docs/devices.md
+++ b/docs/devices.md
@@ -65,6 +65,7 @@ Keyboards (Unifying):
 | K360             | 2.0   | yes     | FN swap, reprog keys                    |
 | K400 Touch       | 2.0   | yes     | FN swap                                 |
 | K750 Solar       | 2.0   | yes     | FN swap, Lux reading, light button      |
+| K780             | 4.5   | yes     | FN swap                                 |
 | K800 Illuminated | 1.0   | yes     | FN swap, reprog keys                    |
 | K830 Illuminated | 2.0   | yes     | FN swap                                 |
 | TK820            | 2.0   | yes     | FN swap                                 |
diff --git a/docs/devices/k780.txt b/docs/devices/k780.txt
new file mode 100644
index 00000000..ef600fee
--- /dev/null
+++ b/docs/devices/k780.txt
@@ -0,0 +1,44 @@
+2: K780 Multi-Device Keyboard
+     Codename     : K780
+     Kind         : keyboard
+     Wireless PID : 405B
+     Protocol     : HID++ 4.5
+     Polling rate : 20 ms (50Hz)
+     Serial number: 4D71FEE1
+        Bootloader: BOT 25.00.B0005
+          Firmware: MPK 01.00.B0018
+             Other: 
+     The power switch is located on the edge of top right corner.
+     Supports 31 HID++ 2.0 features:
+         0: ROOT                   {0000}   
+         1: FEATURE SET            {0001}   
+         2: DEVICE FW VERSION      {0003}   
+         3: DEVICE NAME            {0005}   
+         4: WIRELESS DEVICE STATUS {1D4B}   
+         5: RESET                  {0020}   
+         6: unknown:0007           {0007}   
+         7: BATTERY STATUS         {1000}   
+         8: CHANGE HOST            {1814}   
+         9: unknown:1815           {1815}   
+        10: REPROG CONTROLS V4     {1B04}   
+        11: unknown:1C00           {1C00}   
+        12: NEW FN INVERSION       {40A2}   
+        13: ENCRYPTION             {4100}   
+        14: KEYBOARD DISABLE       {4521}   
+        15: unknown:4531           {4531}   
+        16: LOCK KEY STATE         {4220}   
+        17: unknown:00C2           {00C2}   
+        18: unknown:1803           {1803}   internal, hidden
+        19: unknown:1806           {1806}   internal, hidden
+        20: unknown:1805           {1805}   internal, hidden
+        21: unknown:1813           {1813}   internal, hidden
+        22: unknown:1830           {1830}   internal, hidden
+        23: unknown:1861           {1861}   internal, hidden
+        24: unknown:1890           {1890}   internal, hidden
+        25: unknown:1891           {1891}   internal, hidden
+        26: unknown:18A1           {18A1}   internal, hidden
+        27: unknown:1DF3           {1DF3}   internal, hidden
+        28: unknown:1E00           {1E00}   hidden
+        29: unknown:1EB0           {1EB0}   internal, hidden
+        30: unknown:18B0           {18B0}   internal, hidden
+     Battery: 90%, discharging.
diff --git a/lib/logitech_receiver/descriptors.py b/lib/logitech_receiver/descriptors.py
index 200cdb7d..0cb6d308 100644
--- a/lib/logitech_receiver/descriptors.py
+++ b/lib/logitech_receiver/descriptors.py
@@ -192,6 +192,11 @@ _D('Wireless Solar Keyboard K750', protocol=2.0, wpid='4002',
 							_FS.fn_swap()
 						],
 				)
+_D('Wireless Solar Keyboard K780', protocol=4.5, wpid='405B',
+				settings=[
+							_FS.new_fn_swap()
+						],
+				)
 _D('Wireless Illuminated Keyboard K800', protocol=1.0, wpid='2010',
 				registers=(_R.battery_status, _R.three_leds, ),
 				settings=[