It is used to start up the unit and regulate flow.
The black plastic case features a sowing switch and indicator light:
A green LED for ventilation,
On/off switch to control dispensing,
A flow potentiometer graduated from 0 to 30.
Power supply harness included with the box: The box includes a 3-pin plug for power supply to the tractor with a 1.5-meter harness (2×2.5mm cable) and a 7-pin plug for connection to the distributor (2×2.5mm cable) with a 6-meter harness.
