Logitech K400 Plus did not come with a USB dongle? Wait!! It's hidden in the box!! | THINKBOX
Logitech K400 Plus Wireless Touch Keyboard - Newegg.com
Logitech Wireless Keyboard K400 Plus Touch (Dark Grey) Unifying Usb Receiver 18-Months Battery Life 13 Function Integrated Hot Logitech
Logitech K400 specifications
LOGITECH K400 Plus Wireless Keyboard with Touchpad & Entertainment Media Keys Tiny USB Unifying receiver for HTPC connected TVs KBLT-K830BT (L-KBL-K400PLUS) shop at AUSTiC SHOP
Logitech K400 Wireless Keyboard (NO RECEIVER)(NO BATTERY COVER)
Logitech K400r Wireless Keyboard with Built-In Multi-Touch Touchpad w/ Receiver – St. John's Institute (Hua Ming)