material: nylong PA66 500,000 times continuous sparks 130oC high temperature for continous working 24 hours at least can be used with 220-240v, 110/120v or both voltage 110v/220v can be with or without ground filter, can add 6800nf condenser different spark frequency available for different customer's needs all models of 2,3,4,5,6,7,8 outlet available, single spark is also available.