Shark FlexStyle Next-Gen IonCurl 5-in-1 Hair Styler HD840

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Product guide

Shark FlexStyle Next-Gen IonCurl 5-in-1 Hair Styler HD840

Styler: Shark FlexStyle Next-Gen IonCurl HD840 combines a hair dryer with interchangeable styling attachments, including auto-wrap curlers, a smoothing polisher, oval brush and concentrator. Its listing describes four heat levels up to 203°F and a Scalp Shield mode, customers report positive results for effectiveness and hair feel, but mixed drying-time experiences.

At a glance

Interchangeable attachments support drying, curling and smoothing with one tool.
Two auto-wrap barrels curl in opposite directions, as described in the listing.
The AirSet button can pause airflow or provide a cool-air burst.
Scalp Shield mode and four heat levels offer options for adjusting heat while styling.

Price

$249.00Save 29%

Reference price: ~~$349.99~~

Price checked: Nov 11, 2026

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Pros and cons

Pros

The included set combines two auto-wrap curlers with a polisher, oval brush and concentrator.
The left and right curlers are designed to wrap in opposite directions, reducing the need to manually wind hair around the barrel.
The listed 1.5-pound weight may suit buyers who prefer a lighter styling tool.

Cons

The supplied attachment set does not include the separately listed compatible diffuser, wide-tooth comb, round brush or paddle brush.

Technical specifications

14 specifications

Identity
Brand	SharkNinja
Model	HD840

Dimensions and installation
Dimensions listed	1.49 x 1.49 x 1.49 inches; 1.5 pounds
Power	1,700-watt motor
Cord length	8-foot cord

Heat and airflow
Heat settings	4 heat levels up to 203°F
Scalp Shield mode	Activate to instantly drop to a cooler, scalp-safe setting
AirSet button	Double-tap to pause airflow mid-style or hold down for a burst of cool air that locks your look in place.

Included styling attachments
Curlers	(2) 1.25in Coanda Auto-Wrap Curlers
Finishing attachment	FrizzFighter High Shine Polisher
Brush	Oval Brush
Dryer attachment	Styling Concentrator

Compatible extra attachments
Optional attachments	Curl-Defining Diffuser, Wide-Tooth Comb, Round Brush, and Paddle Brush.
Warranty	2-year limited warranty

What to know before buying

Listing details to confirm

The listing alternately calls this a 5-in-1 tool and describes it as 4-in-1, treat both as listing labels rather than a settled count of functions. It claims styling without heat damage while also listing four heat levels up to 203°F and describing a cooler Scalp Shield setting, those are manufacturer claims, not independently confirmed outcomes. The listed dimensions combine three measurements with weight, so the exact dimension format is unclear.

Who is it for?

A good fit for

Shoppers seeking a dryer and multi-styler with auto-wrap curling barrels and smoothing attachments in one kit.
People with straight, wavy, curly or coily hair who want to choose among the listed brush, concentrator and curling attachments.

Less suited to

Buyers who need a diffuser or comb included in the selected kit.
Anyone looking for independently verified claims about heat damage, drying speed or lasting results.

Shark FlexStyle Next-Gen IonCurl 5-in-1 Hair Styler HD840 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 161 ratings

5 stars84%84%
4 stars5%5%
3 stars4%4%
2 stars2%2%
1 star5%5%

Customer feedback is positive about effectiveness and smoother, healthier-feeling hair, while reports of drying time are mixed: some describe fast drying, others say results do not last even a day. Opinions also differ on value. The 4.6 out of 5 rating across 161 global ratings is favorable overall, but does not resolve those differences or establish how well the listed styling claims will suit a particular hair type.

Positive themes

Customers describe the styler as effective and say their hair feels smoother and healthier.

Mixed feedback

Customers disagree about drying time, with reports ranging from very fast drying to results that do not last a day.
Customers differ on whether the product is worth the money.

Frequently asked questions

Which attachments are listed as included?

The listing names two 1.25in Coanda Auto-Wrap Curlers, a FrizzFighter High Shine Polisher, an Oval Brush and a Styling Concentrator.

Are the diffuser and comb included?

No. They are listed as compatible extra attachments, not among the stated included attachments.

What does the AirSet button do?

The listing says double-tapping pauses airflow mid-style, while holding the button provides a burst of cool air.

What does Scalp Shield mode offer?

The listing describes it as switching to a cooler setting and separately lists four heat levels up to 203°F. These are manufacturer descriptions, not independent performance verification.