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A4Tech FM45S Air specifications and in-depth review

A4Tech FM45S Air

Manufacturer: A4Tech

The A4Tech FM45S Air is a wired mouse aimed at both productivity and gaming use, offering a right-handed ergonomic design that weighs 98 g and measures 108 mm in length, 70 mm in width, and 42 mm in thickness. It connects via a 1.5 m USB cable and carries a straightforward, no-frills appearance with no RGB lighting, keeping the focus firmly on function over aesthetics.

Performance-wise, the mouse runs on an optical sensor with a polling rate of 1000 Hz and a DPI range adjustable between 1000 and 2400 in steps, controlled by a dedicated DPI switching button. All 7 buttons are programmable, including 2 side buttons and a profile switching button, and the mouse stores up to 3 onboard memory profiles for saving custom configurations. It does not feature gesture support, a tilting scroll wheel, a thumb scroll wheel, or extra swappable weights.

Pros
  • All 7 buttons are fully programmable, offering thorough customization for both productivity and gaming workflows
  • Dedicated DPI switching and profile switching buttons allow on-the-fly adjustments without entering software
  • 3 onboard memory profiles let users store different configurations directly on the mouse
  • 1000 Hz polling rate ensures responsive and consistent cursor reporting during use
  • Straightforward wired USB connection via a 1.5 m cable eliminates battery dependency
Cons
  • DPI range tops out at 2400, which is relatively limited for users who need higher sensitivity settings
  • No RGB lighting for users who want visual customization or profile indication through color
  • Designed exclusively for right-handed use, making it unsuitable for left-handed users
  • No tilting scroll wheel, restricting horizontal scrolling to button-based input only
  • Does not support gesture input, which some productivity users may find limiting
Who is this for?

The A4Tech FM45S Air is well suited to right-handed users who want a reliable wired mouse for both office productivity and casual gaming without the complexity of wireless setups. The combination of 7 fully programmable buttons and 3 onboard memory profiles makes it a practical choice for users who frequently switch between different workflows or application environments. Those who prioritize a clean, distraction-free desk setup will also appreciate the no-frills build, as the absence of RGB lighting and the 1.5 m wired USB connection keep things simple and dependable.

Who is this NOT for?

This mouse is not suited to left-handed users, as its ergonomic shape is designed exclusively for right-hand use. Competitive or enthusiast gamers who depend on high DPI sensitivity settings will find the 2400 DPI ceiling restrictive for fast-paced, high-resolution gaming scenarios. Users who rely on horizontal scrolling via a tilting scroll wheel or gesture-based navigation for creative or productivity workflows will also find the feature set lacking, as neither of these input methods is supported.

Performance:

polling rate 1000 Hz
maximum DPI 2400 DPI
minimum DPI 1000 DPI
has adjustable DPI ✓

The mouse operates at a polling rate of 1000 Hz, reporting its position to the system 1000 times per second for responsive cursor movement. DPI is adjustable, spanning from a minimum of 1000 DPI up to a maximum of 2400 DPI, giving users the ability to tune sensitivity to their preference.

General info:

Type Productivity, Gaming
connection type USB
sensor Optical Sensor
onboard memory profiles 3
has gesture support ✕

The A4Tech FM45S Air is positioned as both a productivity and gaming mouse, connecting to the system via USB and relying on an optical sensor for tracking. It stores up to 3 onboard memory profiles, allowing users to save and switch between different button and DPI configurations without needing software running in the background. Gesture support is not available on this mouse.

Buttons:

number of buttons 7
number of side buttons 2
number of programmable buttons 7
has a DPI switching button ✓
has a profile switching button ✓

The mouse features 7 buttons in total, all of which are programmable, giving users full control over button assignments for both productivity and gaming setups. Two of these are side buttons positioned for thumb access, and dedicated DPI switching and profile switching buttons are also included, making it straightforward to adjust sensitivity or swap between saved configurations on the fly.

Design:

Orientation Right-handed
weight 98 g
has RGB lighting ✕
has a tilting scroll wheel ✕
has a thumb scroll wheel ✕
has extra weights ✕
cable length 1.5 m
volume 317.52 cm³
thickness 42 mm
height 108 mm
width 70 mm

The FM45S Air is a right-handed mouse with dimensions of 108 mm in length, 70 mm in width, and 42 mm in thickness, giving it a volume of 317.52 cm³ and a weight of 98 g. It connects via a 1.5 m cable and has a clean, understated build — there is no RGB lighting, no tilting scroll wheel, no thumb scroll wheel, and no provision for extra swappable weights.

Final Verdict

The A4Tech FM45S Air is a focused, no-frills wired mouse that delivers where it counts for right-handed users navigating both productivity and light gaming tasks. Its strongest asset is its fully programmable 7-button layout paired with 3 onboard memory profiles, which gives users meaningful control over their setup without relying on software during use. The 1000 Hz polling rate and wired USB connection ensure consistent, dependable performance. Where it falls short — a modest DPI ceiling, no tilting scroll wheel, and right-hand-only ergonomics — reflects a product clearly designed with a specific, practical audience in mind rather than enthusiast-level demands. For that audience, the FM45S Air is a straightforward and capable daily driver.