Dell Universal Pairing Receiver WR221 - wireless mouse / keyboard receiver - USB, RF 2.4 GHz
Lenovo Unified Pairing - wireless mouse / keyboard receiver - USB
StarTech.com Bluetooth 5.0 Audio Receiver with NFC, Bluetooth Wireless Audio Adapter BT 5.0, 66ft (20m) Range, 3.5mm/RCA or Digital Toslink/SPDIF Optical Output, Lossless HiFi Wolfson DAC - For Stereos/Speakers - Bluetooth wireless audio receiver
Kensington Si600 Wireless Presenter with Laser Pointer presentation remote control - black
TP-Link HA100 - Bluetooth wireless audio receiver for mobile phone, tablet
StarTech.com USB Bluetooth 5.0 Adapter, USB Bluetooth Dongle Receiver for PC/Computer/Laptop/Keyboard/Mouse/Headsets, Range 33ft/10m, EDR (USBA-BLUETOOTH-V5-C2) - network adapter - USB
3Dconnexion CadMouse Pro Wireless - mouse - Bluetooth, 2.4 GHz
Convert a PS/2 keyboard and mouse to a single USB interface. This PS/2 USB Adapter converts a single USB port into two universal PS/2 ports, letting you connect any PS/2 peripheral (e.g. mouse, keyboard) to a computer through USB.