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Brand: Logitech
Model: H340 USB Computer Headset
Part number: 981-000475
Colour: Black
Connection: USB-A, wired
USB protocol: USB 2.0
Audio output: Digital stereo
Headphone sensitivity: 115 dB ±3 dB
Input impedance: 22 ohms, according to the product listing
Microphone type: Bi-directional, noise-cancelling boom microphone
Microphone placement: Right-sided, rotating boom
Microphone sensitivity: −42 dBV/Pa ±3 dB
Microphone frequency response: 100 Hz–16 kHz, according to the product listing
Headband: Adjustable
Ear cushions: Swivel-mounted foam
Cable length: 1.8 metres
Product dimensions: 160 mm high × 175 mm wide × 60 mm deep, according to Logitech’s product page
Listed product weight: Approximately 100 g
Operating system compatibility: Windows, macOS and ChromeOS, subject to device and application requirements
Software requirement: No additional software needed for basic operation
Specifications
Specifications
Brand: Logitech
Model: H540 USB Computer Headset
Part number: 981-000480
Product category: Wired computer headset
Colour: Black
Wearing style: Over-the-head, on-ear stereo headset
Connectivity: Wired USB-A
Audio output: Digital stereo
Driver technology: Laser-tuned drivers with built-in equaliser
Headphone input impedance: 20 ohms
Headphone sensitivity: Approximately 115 dB ±3 dB
Microphone type: Noise-cancelling boom microphone
Microphone position: Right-sided, adjustable boom
Microphone frequency response: Published specifications vary by source; commonly listed as 100 Hz–16 kHz
Microphone sensitivity: Approximately −42 dBV/Pa ±3 dB
Audio controls: On-ear volume and microphone mute controls
Mute indicator: Indicator light on the headset cable
Cable length: Approximately 1.8 metres
Specifications
Brand: Logitech
Product series: H570e
Model number: 981-000575
Colour: Black
Connection: USB-A
Cable length: Approximately 1.9 metres
Microphone type: Bidirectional ECM noise-cancelling microphone
Microphone frequency response: 100 Hz–8 kHz in the current UC specification
Speaker frequency response: 31.5 Hz–20 kHz (diffuse-field specification)
Audio technology: Digital signal processing (DSP) and acoustic echo cancellation
In-line controls: Volume up/down, microphone mute and call answer/end
LED indicators: Red mute indicator; call indicators depend on the supported platform
 Replaceable leatherette
Headset dimensions: Approximately 171 × 152 × 50 mm (H × W × D)
Specifications
Brand: Logitech
Product series: H650e
Model number: 981-000519
Colour: Black
Headset type: Wired business stereo headset
Connection: USB-A
Microphone type: Bidirectional ECM noise-cancelling microphone
Microphone frequency response: 100 Hz–10 kHz
Speaker driver size: 32 mm
Speaker frequency response: 50 Hz–10 kHz
Speaker sensitivity: 90 dB ±3 dB at 1 kHz
Audio technologies: Digital signal processing (DSP), acoustic echo cancellation and dynamic equalizer
In-line controls: Volume up, volume down, mute and call answer/end controls
Visual indicators: In-call LED and mute status indicator
Cable length: 2.1 metres
Headset dimensions: 174 × 165 × 50 mm (W × H × D)
Headset weight: Approximately 120 g
Compatibility: Windows 8 or later, macOS 10.7 or later and Linux, subject to system support
USB requirement: One available USB port
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Logitech Group - 960-001057 
