Check out this simple and short video on HOW TO CONNECT TWO SETS OF MARS T1000?

Some may ask why the accessory is necessary. Here is why: the RJ45 on the MARS T1000 (any intercom system) transmits analog audio signals instead of network signals.

We would recommend users who intend to connect two systems to buy the connection package from our local dealers or at least consult them before purchasing two systems since the RJ45 requires a specific definition of pin order and color.