The guys over @ discountvapers contacted me with an exclusive deal. They are selling the 510/EGO connected Variable Voltage pass-through for $9.99. I own one of these and they are rock solid. Works with both 510 and EGO connections.
Stainless Steel Construction.
Plug into your USB port.
5 presses advances you to each voltage level and lights the appropriate led light:
Use coupon code VJP to bring the total cost of this item down to $9.99
* this coupon was given to me by the vendor, it is not an affiliate code