The “X” is the smallest and lightest high voltage recycling product in the world. The “X” has the longest performance warranty of any other brand of HV Pack. In fact, look closely at the warranty from other brands, you will see that the performance is ONLY guaranteed when their products are new and the warranty period only covers “manufactures defects” and not actual performance after you use it for months or years. The Lumedyne “X” has a full two year warranty including the guaranteed performance of the rechargeable Lithium battery! Even after the warranty, the Lithium battery can be exchanged and recycled when needed at the factory in Florida or an Authorized Lumedyne Service Center for a small fraction of the cost of replacing the whole “X”.