Schneider Electric E8231RJS4_MB_G1 1G Telephone Socket Shuttered Keystone Wallplate is a type of wall plate designed to accommodate a single (1G) telephone socket and may include a cover or shutter to protect the socket when it's not in use. The keystone is a standardized snap-in module format that allows various types of connectors to be easily inserted and removed. A one-gang wall plate is designed to fit a single electrical or data outlet.

This is a specific type of connector designed for telephone lines. It allows one to connect a telephone or other telecommunications device to a phone line. The wallplate has a cover or shutter mechanism that can be used to protect the socket when it's not in use. This is particularly useful for keeping out dust and preventing accidental damage. Keystone is a modular system for mounting various types of connectors into a wall plate or patch panel. 

So, Schneider Electric E8231RJS4_MB_G1 1G Telephone Socket Shuttered Keystone Wallplate is a wall plate designed to hold a single telephone socket with a protective cover. It likely uses a keystone-style mounting system for easy installation and customization.

Features

• Uncluttered Design with distinctive jumbo dolly
• Slim Profile
• SS Mechanism Technology allows for a 3-degree short throw switching angle and flutter-free switching
• Perfect face technology allows for perfect rocker alignment