The JO-2001b is a smart, portable ionizer air cleaner designed to be worn as a necklace. Here are some key features:

Portable Design: Compact and lightweight, perfect for on-the-go use.
Ionization Technology: Emits ions to neutralize pollutants and allergens in the air.
Touch Screen: Easy-to-use interface for adjusting settings.
Battery Life: Long-lasting battery for extended use.

It's a convenient way to keep the air around you clean and fresh.