A 600Mbps USB Wi-Fi adapter typically supports dual-band wireless (2.4 GHz and 5 GHz) and is designed to connect to a computer via USB. These adapters often adhere to the 802.11ac standard and are backward compatible with older standards like 802.11a/b/g/n. They aim to provide faster wireless speeds compared to older standards, particularly on the 5GHz band, and can be useful for tasks like streaming HD video and online gaming. 
Here's a breakdown of common specifications:
Data Transfer Rate: Up to 600 Mbps (typically 150 Mbps on 2.4 GHz and 433 Mbps on 5 GHz). 
Wireless Standards: 802.11ac (also supports 802.11a/b/g/n). 
Frequency Bands: Dual-band (2.4 GHz and 5 GHz). 
Interface: USB 2.0 or USB 3.0. 
Antenna: May include an internal or external antenna (e.g., 5dBi). 
Operating Systems: Compatible with various operating systems like Windows (including older versions like XP, Vista, 7, 8, 10, and 11) and sometimes Linux or macOS. 
Security: Supports security protocols like WPA/WPA2. 
Other Features: Some adapters may include features like a WPS button for easy encryption setup and a compact, nano-sized design for portability.