SONY - WH-1000XM4 Wireless Noise Cancelling Headphones (Silver)

Headband style High-Resolution Audio headphones with industry-leading noise cancellation, Adaptive Sound Control, and Speak-to-Chat mode.
Intelligent and intuitive, the WH-1000XM4 headphones offer further improvements to our industry-leading noise cancellation, exceptional sound quality, and smart listening that adjusts to your behavior and your location.

Quick Attention
Need to quickly hear voices or sounds around you? Just place your hand over the housing to instantly turn your music volume down and let ambient sound in.
Wear all day in total comfort
WH-1000XM4 headphones blend sophisticated styling with exceptional comfort. Super-soft, pressure-relieving earpads in foamed urethane evenly distribute pressure and increase ear/pad contact for a stable fit. And with a lighter-weight design, you'll barely notice you're wearing them.
All day power and quick charging
With a huge 30 hours of battery life you'll have enough power even for long trips. And if you need to top up in a hurry, you can get 5 hours' worth of charge after just 10 minutes with the optional AC adapter.
Be smarter with Voice Assistant
Manage your day, just by asking your assistant. Enjoy entertainment, connect with friends, get information, listen to music and notifications, set reminders, and more.
Clearer hands-free calling 
Conversation flows freely with easy, hands-free calling. Leave your phone where it is, just speak with a double tap. Thanks to Precise Voice Pickup Technology, which combines five built-in microphones with advanced audio signal processing, WH-1000XM4 delivers clearer voice quality to the other person on the phone. 
Control at your fingertips
Change the track, turn the volume up or down, and take or make calls just by tapping or swiping the panel.
Sony | Headphones Connect app
With the Sony | Headphones Connect app, Ambient Sound Control lets you adjust the volume of background sound and gives you the option to allow voices alone to be heard. Meanwhile the Equaliser lets you customise sound levels to suit your music.
Multipoint connection
For total convenience, WH-1000XM4 headphones can be paired with two Bluetooth devices at the same time. So when a call comes in, your headphones know which device is ringing and connect to the right one automatically. You'll also be able to quickly, smoothly switch your headphones to either of the two devices at the touch of a button.
Swivel foldable structure
The ear cups swivel inwards so they pack up neatly in a compact case. 
Carry case with cable
The supplied carry case is durable and includes a cable for wired listening.

Specifications

Driver Unit : 40mm, dome type (CCAW Voice coil)
DSEE Extreme : Yes
Frequency Response : 4Hz-40,000Hz
Frequency Response(Bluetooth Communication) : 20Hz - 20,000Hz (44.1kHz Sampling) / 20Hz - 40,000Hz (LDAC 96kHz Sampling, 990kbps)
Frequency Response (Active Operation) : 4Hz-40,000Hz
Passive Operation : Yes
NFC : Yes
Cord Length : Headphone cable (approx. 1.2m, OFC strands, gold-plated stereo mini plug)
Noise Cancelling ON/OFF Switch : Yes
Personal NC Optimizer : Yes
Frequency Range : 2.4GHz band (2.4000GHz-2.4835GHz)
Profile : A2DP, AVRCP, HFP, HSP
Supported Audio Format(s) : SBC, AAC, LDAC
Supported Content Protection : SCMS-T
Volume Control : Touch Sensor
Atmospheric Pressure Optimizing : Yes
Ambient Sound Mode : Yes
Quick Attention : Yes
Effective Range : Line of sight approx.30ft (10m)
Input(s) : Stereo Mini Jack