Blackout-Black 35.5in x 39in Cellular Shades - No Drill Cordless

Our review of the Blackout-Black 35.5in x 39in cellular shades finds them ideal for renters, bedrooms, and anyone who needs true darkness with a damage-free install. The single biggest reason to buy is the combination of complete light blocking and a cordless, no-drill mounting system that really does install in under a minute. Installation is quiet and simple, the fabric feels durable, and the honeycomb construction delivers measurable thermal and noise benefits without drilling or tools.

Key Features

• Size reminder: The manufacturer trims 3mm from the ordered width to ensure a precise fit, and they confirm dimensions before production for a worry-free custom size option.
• 30-second installation: The no-screws, damage-free design installs without tools or holes, making it suitable for apartments and quick room changes.
• Safe cordless system: The cordless spring mechanism operates quietly and removes dangling cords, which improves safety for children and pets.
• Blackout and energy saving: The honeycomb cells trap air to reduce heat transfer and block light, helping maintain comfortable indoor temperatures and protect furniture from UV fading.
• Excellent durability: A lamellar spring system and rust-proof aluminum frame are lab-tested for 10,000+ lifts and harsh conditions, resisting peeling, cracking, and odor.

Who It's For

This model is best for renters, shift workers, light-sensitive sleepers, or anyone creating a home theater or nursery who needs reliable blackout performance without permanent mounting. The cordless design and quick install make it especially attractive to people who move frequently or who cannot alter window frames.

Those who need motorized controls, very large custom treatments, or an exact factory-clear width without the 3mm trim might prefer a different solution. Also, if absolute maximum stability under high-wind or exterior-facing windows is required, consider a professionally mounted alternative.

Pros & Cons

Pros

• Truly effective blackout performance that also reduces heat transfer and dampens outside noise.
• Fast, no-drill installation that leaves no holes and suits rented homes or temporary setups.
• Quiet, cordless spring operation that enhances child and pet safety and provides a smooth glide.
• Durable materials and components tested for long-term use and extreme conditions.

Cons

• The factory width is trimmed by 3mm by default, which is ideal for fit but requires careful measurement and attention when ordering.
• Stability opinions are mixed among customers, so extremely high-stress mounting situations may need extra attention.

Specifications

Brand	HOTSOON
Model color	Blackout-Black
Size	35.5in W x 39in H (factory trims 3mm width)
Mounting	No-drill, cordless installation (damage-free)
Function	Blackout honeycomb with thermal insulation and noise reduction
Operation	Cordless spring mechanism, quiet glide
Durability	Rust-proof aluminum frame; tested for 10,000+ lifts

Our Verdict

These blackout cellular shades are a smart value for anyone who needs quick, damage-free blackout and improved insulation. The cordless install, durable build, and real light- and heat-blocking performance make them especially well suited to renters, bedrooms, and home theaters. Measure carefully and order the custom size option if needed, and expect a reliable, long-lasting window treatment without drilling.

Frequently Asked Questions

How long does installation take?
Installation uses the no-drill system and typically takes under a minute when measurements are correct.

Will these shades block light completely?
Yes, the blackout fabric and honeycomb design are intended to block sunlight and reduce room light noticeably for better sleep and media rooms.

Are these safe for homes with children and pets?
The cordless spring operation eliminates dangling cords, making the shades a safer choice around children and pets.