MERTTURM Rechargeable USB Fan

Name: MERTTURM Rechargeable USB Fan
Brand: MERTTURM
SKU: mertturm-table-fan
Rating: 4.3 (13 reviews)

(13 reviews)

The only cordless fan in our selection: a 4000 mAh battery and automatic 270° oscillation, cooling anywhere, even with no socket nearby.

Check price and availability on Amazon

Buy on Amazon

As an Amazon Associate, I earn from qualifying purchases.

Key features

Battery life: 4 to 13h depending on speed, 4000 mAh battery
Speeds: 4 speeds with digital display
Oscillation: Automatic horizontal 270°, manual tilt 105°
The only cordless model in our selection: rechargeable 4000 mAh battery

In detail: MERTTURM Cordless USB Desk Fan

The MERTTURM stands apart from the rest of our table fan selection with one distinctive feature: it runs entirely on battery power, with no need for a mains socket nearby. Its 4000 mAh battery offers a stated runtime of 4 to 13 hours depending on the speed chosen, plenty to cover a full evening in the garden, a work session at the desk, or a weekend of camping.

Four speeds are available, adjusted via a built-in digital display that also shows remaining battery, a handy detail for planning the next recharge. Recharging itself is done simply via a USB cable, compatible with a computer, a power bank, or a car charger, making it a versatile companion both at home and on the move.

Its automatic 270° horizontal oscillation, switched on with a single press of a dedicated button, covers a noticeably wider area than most desk fans on the market. It pairs with a manually adjustable 105° vertical tilt, letting you aim the airflow precisely wherever you're sitting or lying. The brand states a contained noise level around 30 dB(A), quiet enough to suit a bedroom or a shared workspace.

With its compact 19.2 x 12 x 7 cm footprint, the MERTTURM slips easily into a bag for travel, camping, or simply moving from room to room without unplugging anything. The front grille comes off for easy regular cleaning. This cordless format makes it a great complement to the mains-powered table fans in our selection, for the moments when no socket is available: patio, camping trip, or a simple break in the garden during high summer.

Technical data

Detailed characteristics

Performance

Speeds?Number of fan speeds offered by the unit.	4 speeds, digital display (speed and remaining battery)
Horizontal oscillation?Automatic side-to-side sweeping motion, to spread the airflow over a wider area.	Automatic at 270°, activated by a single button press
Noise level?Noise emitted by the unit, in decibels (dB(A)). As a reference, a normal conversation is around 60 dB(A).	About 30 dB(A) claimed by the brand

Features

Battery life?Runtime on battery power, for rechargeable models.	4 to 13h depending on speed chosen

Dimensions and power supply

Dimensions?Width, depth and height of the unit (W x D x H).	19.2 x 12 x 7 cm
Power supply?How the unit is powered (mains, USB/battery, disposable batteries).	Rechargeable 4000 mAh battery (recharges via USB port)

Additional information

Battery	4000 mAh, USB rechargeable (computer, power bank, car charger)
Vertical tilt	Manually adjustable across 105°
Maintenance	Front grille detachable for cleaning

Comparison

At a similar budget, the MERTTURM USB Desk Fan regularly comes up against the Midea FT40-21M in searches for affordable table fans, even though the two serve different needs: cordless on battery for one, mains-powered for the other. Here's how they compare based on manufacturer data.

Comparison: MERTTURM vs the Midea FT40-21M (manufacturer data, for guidance only)
Criterion	MERTTURM	Midea FT40-21M
Power supply	4000 mAh rechargeable battery	Mains (220-240V)
Speeds	4 speeds	3 speeds
Oscillation	Automatic at 270°	Automatic at 80°
Battery life	4 to 13h depending on speed	Unlimited (mains powered)
Format	Compact, personal use	40cm diameter, cools a whole room
Price seen	≈ £28	≈ £34

In short, the MERTTURM offers total placement freedom thanks to its rechargeable battery, ideal for camping, a patio, or on-the-go use with no socket nearby. The Midea FT40-21M answers with genuine airflow built to cool a whole room from the mains, with no recharging to worry about. The choice mainly comes down to intended use: on-the-go for the MERTTURM, fixed and generous for the Midea.

Our tester's verdict: Benoit Richard

See our tester's profile

On a patio, while camping, or on a desk with no socket nearby, the MERTTURM earns its keep thanks to its 4000 mAh battery: expect 4 hours at full speed up to 13 hours on the lowest setting, plenty for a full evening or several days of occasional use. The automatic 270° oscillation, switched on with a single button press, covers a far wider area than most desk fans, with a manual 105° tilt adjustment thrown in as well. The digital display showing speed and remaining battery is a genuinely useful touch day to day, you always know when a recharge is coming without any nasty surprises. The format stays compact, almost personal, closer to an individual backup fan than to a model capable of cooling a whole room like the mains-powered units in our selection. A full recharge takes several hours, worth planning ahead of a trip. For on-the-go use or as a quick fix, it's a smart, affordable choice at under £30.

Frequently asked questions: MERTTURM Cordless USB Desk Fan

🔌 How long does the MERTTURM battery last?

With its 4000 mAh battery, runtime ranges from 4 hours at full speed to 13 hours on the lowest speed, according to the manufacturer.

🔌 How do you recharge the MERTTURM fan?

It recharges via a USB cable, plugged into a computer, a power bank, a car charger, or a USB mains adapter, with no traditional mains cable included.

❄ Can the MERTTURM oscillate automatically?

Yes, pressing the S button activates automatic 270° horizontal oscillation, alongside a manually adjustable 105° vertical tilt.

❄ Does the MERTTURM suit camping or patio use?

Yes, that's precisely one of its main strengths: cordless thanks to its rechargeable battery, it works anywhere with no mains socket nearby, unlike a classic table fan.