Servonaut MPS10 3 channel mini power switch. Made in Germany by tematik.

Features

The MPS10 is a memory switch with three outputs, one of them with a high current 10A relay. The MPS10 gets its power from the receiver. You need one channel of your radio. This can be one of the stick channels or a channel with an on/off/on switch. A short activation switches S2 on and off. A long activation switches L1 on and off. Activation in the opposite direction switches the relay on and off. Mode of relay activation is set by J2 (see above).