can you use only one bud at a time as I tend to do in bed

Hi falih, You can remove one headset unit from the charging case and use the headset unit by itself. In this case, only the headset unit that has been removed from the charging case will turn on: https://cutt.ly/96UPJup (copy and paste the link into your web browser). Also, we recommend checking this link to learn more about the unit: https://cutt.ly/46UDtqe (copy and paste the link into your web browser). Sony Support UK

Thanks. What specific comply foam tips are compataible please?

Hi Simon, The earbud tips are not foam, they are Hybrid silicone rubber earbud tips: https://cutt.ly/Q5ELEG4 (Copy and paste the link into your web browser). We'd also like to confirm that we do not make a foam tips compatible with these headphones, and we cannot guarantee the functionality of a third party earbid tips. Sony Support UK

Are these earbuds comfortable enough for all night use?

They are comfortable for most of day. But I rather think they would fall out at night.

Should the noise reduction cancel all the noises or is it normal that even if quieter I can ear all the noises when the music is not on?

Hi Giovanni, The noise cancelling circuit senses outside noise using built-in microphones and sends an equal-but-opposite cancelling signal to the headset. By producing this countersignal, your headphones block a large part of external sound sources. However, it's important to remember the following: -The effect may not be pronounced in a tranquil environment, or some sound may be heard. If there is little ambient noise, it's advisable not to switch on the NC function, as it needs ambient input to work optimally. Sound can only travel if there is a medium to transport it, such as air, water, glass, or metal. If you stand in an empty room with a speaker playing music, you will hear the music. However, if the air from this room is removed, the speaker will still function, but you won't hear any sound as there's no medium to transport the sound waves. You may hear external sound when using Noise Cancelling due to: -Air trapped between your audio device and eardrum. -Different pitch levels. Noise cancelling works best when the ambient noise is low or medium in pitch and remains constant. For example, an airplane engine produces a low-pitched, constant sound, meaning that the level of sound you hear remains consistent. Conversely, when someone speaks, sound waves scatter based on the volume and energy created by every word. Unlike a plane engine, speaking pitch changes frequently. That is why you might hear someone talking next to you. To read more about the noise-cancelling feature, check out these links: https://cutt.ly/6wuWltGQ & https://cutt.ly/UwdZMim9 (Copy and paste the link into your web browser) Sony Support UK

Control Method	Remote
Controller Type	Media Control
Control Type	Media Control
Unit Count	1 count
Item Weight	5 Grams
Wireless Technology	Bluetooth
Connectivity Technology	Wireless
Frequency Range	20 Hz - 20,000 Hz
Noise Control	Sound Isolation
Headphone Folding Features	In Ear
Earpiece Shape	rounded
Headphones Ear Placement	In Ear
Carrying Case Color	Black
Style Name	Modern
Color	Black
Battery Charge Time	3 Hours
Water Resistance Level	Not Water Resistant
Carrying Case Material	Case
Is Electric	Yes
Antenna Location	Calling
Compatible Devices	Various Bluetooth-enabled devices
Cable Features	Without Cable
Additional Features	Auto On/Off, Hands-Free Calls, Quick Charge, Customizable Sound, Compact and Portable, Audio Transparency, Secure Fit, Travel-Friendly
Enclosure Material	Plastic
Specific Uses For Product	Music

WF-C700N Wireless, Bluetooth, Noise Cancelling Earbuds (Small, Lightweight Earbuds with Multi-Point Connection, IPX4 rating, up to 20 HR battery, Quick Charge, iOS & Android) Black

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