Includes a relay selection jumper cap for configuration Optocoupler isolation provides voltage isolation to prevent interference with the control side Easy installation on standard guide rails with a common mounting design for straightforward setup Dual relay module with ample capacity for switching multiple loads Reliable performance suitable for automation projects, industrial control, and home automation applications Use scenarios Home automation: control lights or fans from a microcontroller or SBC while benefiting from opto isolation to protect the control circuitry Industrial control: interface with PLCs or other control systems to switch external equipment or alarms with added electrical isolation Test bench or prototyping: drive external devices during development while keeping the control side isolated and safe Specifications and attributes Type: dual relay module Includes: relay selection jumper cap Isolation: optocoupler isolation to minimize voltage interference Mounting: standard guide rail (DIN rail) design for easy installation Capacity: large capacity suitable for multiple switched loads This description maintains the original product's emphasis on a dual relay module with a jumper cap, optocoupler isolation, easy DIN rail installation, and a capacity suitable for various loads, while presenting the information in a clear, userfriendly format with practical use cases.