Can I control the volume from my smartphone or pc?

This is just a pass through. You control the volume on your source or your destination. For example I have an iPod. I can increase the volume on my iPod or I can increase the volume on the Soundbar I have this unit connected to.

Can I connect two smartphones at the same time?

I don't believe so. you can connect from two phones ( one at a time ) as your phone will find and connect to the system, but the system can not handle the connection of 2 systems in parallel.

What kind of bluetooth is it? 3.0, 4.0 or 4.2

I don’t recall that info being included in the paperwork, a quick gander at the information on the ad itself didn’t yield any answers either. The Logitech model (identical case and lights) have reviews from 5 years ago that say it’s BT 3.0. However some have a sticker that call it item #bt4.1 🤔. Regardless, for the stereo application I have this for, the computer connects IMMEDIATELY upon power up so the low latency would make me believe that it is at least 4.0. All are backwards compatible- so- it should work regardless. Mine streams FLAC with no issue or hiccup. Sorry I couldn’t give you a direct answer- the oldest models I would believe to be 3.0, maybe 4.0, doubtful it’s 5 as this model has been for sale for quite some time already.

does esinkin w20-us receiver work with skullcandy weadphones--please advise how?---jim

yes it works with 3.5mm headphones. but you're better off getting an earstudio es100 or something similar if you want something portable.

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Esinkin Wireless Audio receiver for Music Streaming Sound System Works with Smart Phones and Tablets, Wireless Adapter for Speakers

Esinkin Wireless Audio receiver for Music Streaming Sound System Works with Smart Phones and Tablets, Wireless Adapter for Speakers

Product ID: 315613281

Details

Brand
esinkin
Connectivity technology
RCA USB
Material
Plastic
Power source
Corded
Special features
RCA

🎵High-quality stereo sound

📶15m wireless range

🔌Plug & play RCA/3.5mm

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Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Upgrade your sound, ditch the wires, join the wireless revolution!

EXTENDED FREEDOM ZONE - Control your tunes from up to 50 feet away—no more being tethered to your sound system.
PREMIUM SOUND REVIVAL - Breathe new life into your classic sound system with crisp, clear stereo acoustics.
PLUG PLAY SIMPLICITY - One-button setup means no tech headaches—just instant music magic.
SEAMLESS WIRELESS STREAMING - Transform any speaker into a wireless powerhouse with effortless smartphone/tablet pairing.
UNIVERSAL SPEAKER COMPATIBILITY - Works flawlessly with A/V receivers, powered speakers, and even car audio systems.

The Esinkin Wireless Audio Receiver effortlessly converts your existing speakers into a wireless streaming system compatible with smartphones and tablets. Featuring a simple one-button pairing, 15-meter wireless range, and universal RCA/3.5mm connectivity, it delivers high-quality stereo sound without the clutter of cables—perfect for revitalizing your home or car audio setup.

Specifications

ASIN	B07FZ3G7SC
Additional Features	RCA
Audio Input	[INF: Smartphones, Tablets, A/V Receivers, Powered Speakers]
Audio Output Mode	Stereo
Audio Output Type	Speaker
Best Sellers Rank	#43,360 in Electronics ( See Top 100 in Electronics ) #106 in Wireless Audio Receivers & Adapters
Bluetooth support?	No
Brand	esinkin
Color	Black
Compatibility Options	Tablet
Compatible Devices	Tablet, Speaker, Smartphone
Compatible with Vehicle Type	Car
Connectivity Technology	RCA, USB
Connector Type Used on Cable	RCA
Control Method	App
Control Type	Remote Control
Controller Type	Remote Control
Customer Reviews	4.5 4.5 out of 5 stars (7,552)
Data Link Protocol	Wi-Fi 4
Enclosure Material	Plastic
Hardware Interface	USB
Human Interface Input	Touchscreen
Includes Remote	No
Installation Type	Self-installation
Item Dimensions L x W x H	50L x 50W x 23H millimeters
Item Weight	0.19 Kilograms
Manufacturer	esinkin
Number of Channels	5
Outer Material	Plastic
Power Source	Corded Electric
Rechargeable Battery Included	No
Supported Application	General Audio Applications
Supported Media Type	MP3
Supported Standards	IEEE 802.11bgN
UPC	717850936228
Unit Count	1.0 Count
Wireless Compability	802.11bgn

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