16 GB of nonvolatile memory and a microSD - slot supporting memory cards up to 32 GB allows the user to store up to 40000 books. (onyxboox.com)
And 8 GB of nonvolatile memory and a microSD - slot supporting memory cards up to 32 GB allows the user to store a large library. (onyxboox.com)
Technically speaking, citrus oils are not essential oils at all because they contain nonvolatile principles, but the aromatherapy and chemistry communities have made an exception to the rule. (mindbodygreen.com)