Single Bluetooth Wireless Earbud Mini Wireless Earbud Bluetooth in Ear Headphone Single Earbud Small Wireless Invisible Headphones Suitable for Sports

Walmart - KCaHFO

Small, discreet in-ear form factor matches, Wireless design aligns with source, Dark color (black) is consistent with 'dark gray', Overall shape and size are highly similar, Category (Earbud Headphones) matches

Wireless Earbud with Bluetooth, in Ear, Light-weight, Headphones, Built-in Microphone

Walmart - maho

Wireless functionality, Compact in-ear design, fitting entirely within the ear, Dark color, closely matching dark gray/black, Similar size and discreet appearance, High-priority retailer (Walmart)

The QuantumSphere Elite - Android Smartwatch with Earbuds - Grey Technologies

Grey Technologies

Small, in-ear form factor, Dark gray/black color, Discreet design, fits snugly in the ear, Wireless functionality implied by 'TWS headset'