The TET system transmits electrical energy from an external to an internal coil. The subcutaneously implanted internal coil has a diameter of 70 mm. The external coil has an inner diameter of 70 mm and an outer diameter of 100 mm. Power from external batteries or other power supplies is converted to high-frequency AC voltage and then converted back to DC voltage by electronics included in the implantable controller. Power losses are remarkably low and local heating is minimal. The TET system is able to support the TAH up to a distance of 30 mm.

The implantable controller is a printed circuit board containing power and communication electronics as well as four battery cells and is connected by three microplugs to the pump unit, the compliance chamber, and the TET coil. It acquires data of the position sensing system and distributes current to the motor coils depending on the position of the coil bobbin and its pusher plates in the pump unit. Electronics are powered by the TET system or the implanted batteries. The batteries get charged by connecting the outer coil of the TET system and can support the device for about 45 min at full capacity.

The compliance chamber is connected to the drive unit, and its operation is controlled by the implantable controller. It prevents suction events and regulates balance between left and right ventricular output by diminishing sharp pressure peaks in the drive unit. Furthermore an integrated pump adjusts air pressure and supports movement of the polyurethane membranes.