Unbranded M1 is a gas direct ignition furnace that provides heating and A/C and is compatible with various blower motor types and speeds. It features multiple safety mechanisms, including a limit switch, pressure switch, and lockout system to ensure safe operation. The control lights indicate the status of the furnace, including normal operation, power issues, flame detection, and error codes. Additionally, the furnace supports field wiring for both 115V and 24V, making it versatile for different electrical setups.