This Cable is a splitter that allows you to connect a USB device to your fire stick. Any mini keyboard such as the one in the images can connect with the Fire Stick by plugging the small USB dongle into the cable's USB port and instantly the mini keyboard will work.
USB Port Terminal Adapter OTG Cable For Fire TV 3 Or 2nd Gen Fire Stick - AliExpress
Ethernet Adapter for FIRE Stick (2nd Gen 3rd Gen and 4K Versions), Micro USB to RJ45 Ethernet Adapter with Power - up to 100Mbps : Electronics
Usb Otg Adapter Power Fire Stick Tv 3 Usb Port Adapter Micro - Temu
OTG Cable Adapter for Firestick 4K Fire Stick TV USB add Keyboard, USB
For Fire Stick Usb Otg Port Adapter Cable 4k 2nd Gen Fire Cube & Fire Tv3
For Fire Stick Usb Otg Port Adapter Cable 4k 2nd Gen Fire Cube & Fire Tv3
Add wired internet and extra storage to TV streaming device ( Fire TV Stick 2nd generation, Fire TV 4K, Fire TV Cube (1gen, 2gen), Xiaomi Mi
Bundle TV Stick 4K Cube Accessories - OTG Cable, USB Ethernet Adapter and Micro USB Charging Cord
TV USB Port Adapter, Micro OTG Cable and Power For Fire Stick 2nd Gen or TV.
New USB PORT ADAPTER OTG Cable for FIRE TV 3 OR 2nd Gen FIRE STICK
Usb Port Terminal Adapter Otg Cable Fire Tv 3 2nd Gen Fire - Temu
2 Pack Usb Port Terminal Adapter Otg Cable For Fire Tv 3 Or 2nd Gen Fire Stick
Usb Port Terminal Adapter Otg Cable For Fire Tv 3 Or 2nd Gen Fire Stick - AliExpress
Compatible for Fire stick Lite 2020, Fire TV Stick with Alexa Voice Remote (2nd Gen -- 2016 release), all-new Fire TV (2017 release), Fire TV
2pcs OTG Cable Bundle Ethernet Adapter with 3 USB Port Replacement for TV Stick 4K/Lite/Cube, Chromecast Streaming Device