K380 Multi-Device Bluetooth Keyboard (Blue)

Electronics Projects with the ESP8266 and ESP32: Building Web Pages, Applications, and WiFi Enabled Devices

Logitech K380 Multi-Device Bluetooth Wireless Keyboard with Easy-Switch for Up to 3 Devices, Slim, 2 Year Battery-PC, Laptop, Windows, Mac, Chrome OS, Android, iPadOS, Apple TV, Off White

Foldable Keyboard, iClever BK08 Bluetooth Keyboard with Sensitive Touchpad (Sync Up to 3 Devices), Pocket-Sized Tri-Folded Portable Keyboard for iPad Mac iPhone Android Windows iOS, Silver

iClever BK05 Bluetooth Keyboard with 3-Color Backlight, Bluetooth 5.1 Multi-Device Foldable Keyboard with Aluminum Alloy Base for iOS Windows Android Tablets, Smartphones, Laptops, PC and More

iClever DK03 Bluetooth Keyboard and Mouse, Rechargeable Dual-Mode (Bluetooth 4.2 + 2.4G) Wireless Keyboard and Mouse Combo, Ultra-Slim Multi-Device Keyboard for Mac, iPad, Apple, Android, Windows

Rii Wireless Bluetooth Keyboard,K22S Multi Device Rechargeable Keyboard Stainless Steel Ultra Slim Bluetooth Keyboard with Multi-Touch Touchpad,Compatible with PC, Mac, Laptop, Windows, Tablet - Black

Getting Started with Bluetooth Low Energy: Tools and Techniques for Low-Power Networking