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

    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)

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.

DENVER BLUETOOTH MICROPHONE

Product information

Wireless Bluetooth headset
Easy to use, pair with your mobile phone and you are ready to listen to music, and take calls with the headphones on (built-in microphone)
Operating range up to 10 meters
Also AUX input for use with cable (needs power in order to work)
Rechargeable battery built-in - 250mAh (charge time app. 3 hours)
Play music time up to 8 hours
Standby time up to 200 hours

Main Features :
Full stereo sound
180 ° rotary microphone
Built-in controls to adjust volume or mute calls
Adjustable headband
Cable length: 1.8 m

Required configuration
         Compatible with most video calling applications on most platforms and operating systems
         Windows® or macOS
         Chrome OS ™
         USB port (Type A port or adapter)
Technical characteristics
Input impedance: 32 Ω
Sensitivity (headphones): 94 dBV / Pa +/- 3 dB
Sensitivity (microphone): -17 dBV / Pa +/- 4 dB
Frequency response (headphones): 20 Hz to 20 kHz
Frequency response (microphone): 100 Hz to 10 kHz
Cable length: 2.33 m
Connections: USB-A compatible (1.1, 2.0, 3.0)
Content
     USB headset for computer
     User documentation

Marque: Power Star
Numéro du modèle de l'article: CASQUE-CHAT
Couleur: Noir / Gris
Dimensions de l'article L xlx H: 0,5 x 0,1 x 0,2 cm
Poids du produit: 200 grammes
Divers: micro casque stéréo pour les conversations sur Internet Chat, musique et jeux sur PCC

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)

connectivity: wired,

length of cable: 2.4 m,

noise reduction microphone, adjustable volume knob,

noise microphone,

connectivity: usb

Type: Bidirectional

Sensitivity (headphones): 111 dBSPL +/- 3 dB

Sensitivity (microphone): -42 dBV / PA +/- 3 dB

Frequency response (headphone): 100 Hz to 10 kHz

Frequency response (microphone): 200 Hz to 6 kHz

Total harmonic distortion: <2%

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

* noise canceling microphone with background noise suppression,

* adjustable microphone boom for ideal position, mute control provides convenient control, 1 x 3.5mm male stereo jack