The Canton Combi 40 T is a program selector and switching unit produced by Canton between 1978 and 1984. Designed in Germany, it features a metal silver finish combined with black plastic elements. This model was part of a series that included various other units, such as the Combi 30, 40 mix, 40 R, and 70. The original price at the time of release was approximately 180 DM, indicating its position in the mid-range segment of audio switching devices. The device is likely aimed at ensuring the seamless switching and selection of audio sources and configurations.