The Wago 753-649 is a coupler with a DIN, IP20, 12x100x69.8mm footprint and a 750/753 signal. It is designed for communication on an M-Bus network, which connects multiple systems or appliances in a local area. It can be used to transfer data, power, and signal between two different wired systems. It is also capable of transmitting power over long distances, making it an ideal solution for numerous applications.