Does this case have USB 3 on the front io ports ?

Yeah it has 2 USB 3 ports, An audio input and output jack and a reboot button (obviously an on/off button as well haha)

Would the Corsair Hydro H100 x 240 fit in this case??

Yes it does, I have fitted my Corsair Hydro H100i Platinum RGB on the top. There is plenty of room. You should have zero stress putting an AIO in there.

What size are the fans?

It has 3 fans, not one like the other person said. The description and images clearly say it has one at rhe rear and two on thw front panel. They are all 120mm

Does the case have room to comfortable mount a 3.5" HDD?

yes there is, in the back if you attach the included rubber feet then it is easy to attach a HDD and there is also room for 2 2.5mm HDD or SSD

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Cooler MasterMasterBox Q300L Computer Case 'Magnetic Patterned Dust Filters, mini tower, Alloy Steel, Modular I/O Panel, Window Side Panel' MCB-Q300L-KANN-S00, Black

Cooler MasterMasterBox Q300L Computer Case 'Magnetic Patterned Dust Filters, mini tower, Alloy Steel, Modular I/O Panel, Window Side Panel' MCB-Q300L-KANN-S00, Black

Product ID: 59059636

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Details

Brand
Cooler Master
Motherboard compatibility
Mini ITX Mini
Case type
Mini-Tower
Recommended uses for product
Video Games
Colour
Black
Material
Alloy Steel

🔄Modular I/O Panel

🧼Magnetic Dust Filters

🌬️Multiple Cooling Options

Description

🖥️ Build it, Show it, Love it!

COOLING POWERHOUSE - Support for multiple fans and radiators ensures your system stays cool under pressure.
SHOWCASE YOUR BUILD - Edge-to-edge transparent panel lets your components shine like the stars they are.
VERSATILE ORIENTATION - Stand it tall or lay it flat—your choice for optimal airflow and style.
AMPLE SPACE FOR UPGRADES - Generous interior dimensions accommodate the latest hardware for future-proofing.
SLEEK FUNCTIONAL DESIGN - Elevate your setup with a minimalist aesthetic that doesn't compromise on performance.

The MasterBox Q300L is a mini tower computer case designed for optimal airflow and aesthetic appeal. It features removable magnetic dust filters, versatile orientation options, and ample space for cooling solutions and hardware upgrades, making it an ideal choice for gamers and professionals alike.

Specifications

Wireless Type	802.11a
Number of USB 3.0 Ports	2
Brand	Cooler Master
Series	Q300L
Item model number	MCB-Q300L-KANN-S00
Item Weight	1.06 pounds
Product Dimensions	15.39 x 9.06 x 15 inches
Item Dimensions LxWxH	15.39 x 9.06 x 15 inches
Color	Black
Department	Computer Cases
Manufacturer	Cooler Master
ASIN	B0785GRMPG
Is Discontinued By Manufacturer	No
Date First Available	December 5, 2017