Protect your equipment Protective device against damaging high voltage. Must be used when powering Pro-7, Acute/D4 or Compact with a 230V petrol electric generator set. Most gas generators with an output of 3000W or more can always power Pro-7 or D4 generators. Please note that on 230V markets a ProGas unit between the gas generator and the Profoto generator is needed in order not to damage the units. For the Acute generator a min 2000W true output gas generator is needed per flash unit and it can also power 2 ComPact flashes.