The difference between the Shark ION WandVac W1 Cordless Handheld Vacuum model WV200 and WV201 are the included accessories.
The WV200 sold at Walmart.com, comes with a Crevice Tool, Multi-Surface Pet Tool, and  Charging Dock.

Whereas the WV201 comes with a Duster Crevice Tool, Multi-Surface Pet Tool, Dual Onboard Accessory Storage, and Charging Dock.

The Crevice Tool is for for cleaning tight places,edges,and other hard to reach areas.

The Multi-Surface Pet Tool is for removing pet hair and larger messes from upholstery and other delicate surfaces.

The Charging Dock charges the vacuum, and provides tool storage with the help of the onboard accessory storage tool.

The Duster Crevice Tool is a 2-in-1 tool for dusting and cleaning hard to reach areas like under appliances and ceiling. It has a bristle brush which can be folded down.

The Dual Onboard Accessory Storage can be snapped into the charging base, stores up to 2 accessories for quick reach.

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The Shark Ion W1 cordless hand vacuum features a brushless motor, is powered by 10.8v Lithium-Ion Battery, takes about 2.5 hours to fully charge, and runs about 10 minutes. It is lightweight, weighs only 1.4 pounds. And comes with a charging cradle for charging and neat storage.  It carries 2 year limited warranty.

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Read Shark WV201 User Reviews at Amazon

Some Questions and Answers:
Is the WandVac battery replaceable?
The battery can be replaced. But it requires tool, such as a flathead screwdriver, to get it done. It was not designed to easily pop off and swap.

Can you charge it in a car?
No.

Can you charge it without the charging base?
No.

Is the charger supports universal voltage?
Yes, the charger supports universal voltage 100-240 V 50/60Hz.

What’s the bin size?
It holds up to 0.08 dry quarts.

Can you use it to pick up wet messes?
No.  It is only a dry vacuum.

Can you use it as a blower?
No.

Is it wall mountable?
No.

Does it use a HEPA filter?
No.

What are the dimensions of the charging base?
Approximately 8×4.25 inches

What are the dimensions of the WandVac?
16.5 X 2.5 X 2.4 inches

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Download manual to learn more:
https://m.sharkclean.com/include/pdf/manual-wv201.pdf