Bluetooth 5.3 what does that mean? My research?

Lyra Series Bluetooth 5.3 Modules

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DOQAUS Bluetooth Headphones Over Ear, Bluetooth Wireless Headphones with Noise Cancellation Foldable Stereo Earphones Wireless Headphones Over Ear for cellphone/PC Black

Renesas Announces Development of Next-Generation Wireless MCUs Supporting New Bluetooth® 5.3 Low Energy Specification

What's New With Bluetooth 5.3 - Dignited

Bluetooth Sound Quality Guide - What are the Codecs, and how do they work — Audiophile Heaven

What is LE Audio and LC3, the latest in Bluetooth audio? - SoundGuys

Bluetooth 5.3 - Features and applications - RF Page