A double bay charger for the Lithium Ion 18650 battery. It has an USB Port which should facilitate mains and car charging. It also works as a power bank.
Especially useful for owners of two-cell lights such as the SD20.
The ARE-X2 has over-voltage; over-current; short circuit and reverse polarity protection. It works with various other rechargeable batteries apart from the 18650 (see Myfenix website for details)