An inductor structure includes a winding turn layer, a shielding layer, and a number of vias. The device comprises an actuator, arranged in the hydraulic line for generating pressure pulsation that compensates for the pressure pulsation of the pump. The packet is processed according to a VLAN aware mode by setting said VLAN identifier equal an identifier associated with the incoming port on which said packet is received An address table is searched using a destination address and the VLAN identifier to determine a destination port. The one or more key tabs and the one or more key slots provide a safety mechanism to distinguish rechargeable battery packs which can be safely charged.