Changshade Blackout Cellular Shade, 21 × 36 in

Changshade blackout cellular shade is a white, cordless window covering listed at 21 inches wide by 36 inches high. It is designed for inside mounting without drilling, but fit depends on the window opening and frame depth.

At a glance

Listing describes a tension-mounted, no-drill installation for inside window frames.
The cordless shade is raised and lowered by hand and can be stopped at a chosen height.
Honeycomb construction is claimed to help reduce heat transfer and soften outside noise.

Price

$27.87Save 24%

Reference price: ~~$36.68~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

Cordless manual control avoids dangling operating cords.
The listed 21 × 36 in size and inside-mount design suit buyers seeking a compact shade for a properly sized window.
Customer feedback reports room darkening, appearance, fit, and no-drill installation as positive points.

Technical specifications

14 specifications

Identity
Brand	Changshade
Model	blinds

Dimensions and installation
Listed size	21"w x 36"h
Mounting type	Inside Mount
Form factor	Rectangular
Installation feature	Tool Free Installation, Window Treatments

Materials and protection
Material	Polyester
Water resistance listed	Moisture Resistant
Color	White
Opacity	Blackout

Operation and care
Operation mode	Manual
Control type	cordless
Care instructions	Spot Clean Only
Recommended use	Indoor

What to know before buying

Measure the window carefully. The listing recommends at least 1.25 inches of frame depth and a shade width about 1/4 inch less than the opening. Blackout, insulation, and noise reduction are listing claims, not quantified performance ratings.

What’s in the box

Included

Mounting hardware
User manual

Who is it for?

A good fit for

Renters or homeowners seeking a cordless inside-mount shade without drilling.
Buyers looking for a room-darkening shade for a bedroom, office, or other indoor space, provided the window fits the specified size.

Less suited to

Windows that do not suit a 21-inch-wide by 36-inch-high shade or lack the recommended inside-mount depth.
Buyers who need an outside-mount installation or a quantified light-blocking or insulation rating.

Changshade Blackout Cellular Shade, 21 × 36 in · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.5 / 5 · 203 ratings

5 stars79%79%
4 stars11%11%
3 stars3%3%
2 stars1%1%
1 star6%6%

Customer feedback highlights perceived room darkening, fit, appearance, and the no-drill installation. Stability and durability feedback is mixed, so buyers who expect frequent handling may want to weigh those concerns. The reported light-blocking experience is relevant to the shade's intended use, but does not establish a measured blackout level.

Positive themes

Customers report effective room darkening and appreciate the appearance and fit.
Customers value the no-drilling installation process.

Mixed feedback

Feedback on stability and durability is mixed, with some finding it durable and others not.

Frequently asked questions

What size is this shade?

The listed size is 21 inches wide by 36 inches high. Measure the opening and follow the listing's recommendation to choose a shade about 1/4 inch narrower than the window.

Does it require drilling?

The listing describes tool-free, no-drill tension mounting for an inside mount. It recommends a minimum window depth of 1.25 inches.

Is the shade cordless?

Yes. It is listed as cordless and manually operated, with hand lifting and lowering.

What comes in the package?

The manufacturer’s included-components list names mounting hardware and a user manual.