Product name:  Logitech H151 Stereo Headset Black
Application: , PC / notebook
Headset type:  Binaural
Fit: On-ear
Connection:  Wired    -
Connectors:  1 x 3.5 mm audio male
Features
Noise-cancellation (NC): Yes

Featuring an adjustable microphone with noise canceling, the Logitech H110 headset is also useful for online conversations with friends and family or for listening to music on your computer. This helmet has an adjustable headband, which makes it remarkably comfortable. In addition, its 3.5mm jack is compatible with most PC sound cards.
Wireless: No
Headphone frequency response: 20 Hz to 20,000 Hz
Microphone frequency response: 100 Hz –16,000 Hz
Sensitivity: -58 dBV / µBar, -38 dBV / Pa +/- 4 dB
Volume control: No
Cable length: 1.8m
Connectivity: 2 x 3.5mm Male Stereo Jack

    Input Impedance:  20 Ohms
    Sensitivity (headphone):  115dB +/-3dB
    Sensitivity (microphone):  -42dBV/Pa +/- 3dB
    Frequency response (Headset):  20Hz - 20kHz
    Frequency response (Microphone):  100Hz - 16kHz
    Cable length:  5.90 ft (1.8m)
    Connections:  USB-A compatible (1.1, 2.0, 3.0)

Easy to use, compact
Active matching
Multipoint technology
LED indicator for charging the battery
Samsung product
Black color
Intra-auricular headset type
Bluetooth Bluetooth connections
Volume Control Functions

HEADSET BULK SANDBERG USB HEADSET
Cable length: 1.8 metres
Connector: 1 x USB A Male plug
Earphone:
Driver unit: 40 mm
Frequency range: 20 Hz – 20 kHz
Impedance: 32 Ohm
Sensitivity: 38dB ± 3dB
Microphone:
Direction: Omni-directional
Frequency Response: 30 Hz - 20 kHz
Impedance: 2.2 kOhm
Sensitivity: -42dB ± 3dB

connectivity: with wire,

length of cable: 2.4 m,

micro noise,

connectivity: usb

Input impedance: 32 Ω

Sensitivity (headphones): 94 dBV / Pa +/- 3 dB

Sensitivity (microphone): -17 dBV / Pa +/- 4 dB

Frequency response (headphone): 20 Hz to 20 kHz

Frequency response (microphone): 100 Hz to 10 kHz

Length of the cable: 2,33 m

Connections: USB-A compatible (1.1, 2.0, 3.0)

 Specifications:

    Manufacturer- Plantronics
    Type of headset- Call center headset
    Type of headset- Corded
    Wearing style- Monaural (On- the- ear)
    Sound output mode- Mono
    Microphone type- Boom
    Frequency response- 150 Hz- 6.80 KHz
    Remote control- Calls answer/ end, Volume, mute

Input impedance: 32 Ω

Sensitivity (headphones): 97 dB +/- 3 dB

Sensitivity (microphone): -47 dBV / PA +/- 3 dB

Frequency response (headphone): 30 Hz to 15 kHz

Frequency response (microphone): 100 Hz to 6.5 kHz

USB-A charging cable length: 1.22 m

Connections: USB-A compatible (1.1, 2.0, 3.0)

Denver BTH-205WHITE.
Product Type: Helmet,
Headset style: Headband,
Product color: White.
Connectivity technology: Wired & Wireless,
USB connector: Micro-USB,
Range of the wireless router: 10 m.
Ear coupling: Supra-aural.
Battery type: Built-in battery,
Battery technology: Lithium,
Battery capacity: 250 mAh.