Can these be used continuously wile plugged in to a wall socket or usb port and a powered speaker?

YES, you can. You also can use the Avantree Quartet transmitter instead as that transmitter has no built-in battery.

Can I only use certain headphones styles for plug in? It doesn’t appear to have an Apple type connection.

You can use any headphones with 3.5 Jack connector

How many headphones can you connect to a receiver? Manuf. website indicates you can connect two to one receiver. So 3 Receivers = 6 headphones connect

AS FAR AS I KNOW, you can connect only 1 3.5mm earphone to each receiver, or 1 optical interface device, but not both at the same time. You *could* use a 3.5mm y-cable to connect 2 3.5mm earphones to one receiver, but keep in mind there is only 1 volume control on the receiver, so both earphones would be at same volume. I am not aware of any manufacturer support for 2 earphones connected to one receiver. I suggest you ask Avantree this question to clarify their support.

Can the transmitter have a microphone as the audio source?

Yes, you can connect the transmitter to a microphone headphone monitor output as audio source. If your microphone does not have that output, then it will not work.

Avantree Audiplex | Desertcart Barbados

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Description

🎧 Elevate your soundscape—wireless audio, redefined for the connected generation.

UNIVERSAL COMPATIBILITY - Seamlessly pairs with any AUX or optical output device and works with most headphones and speakers on the market.
PERSONALIZED VOLUME CONTROL - Each receiver offers independent volume adjustment, empowering every listener to customize their audio experience.
CRYSTAL CLEAR LAG FREE AUDIO - Experience near-zero lip-sync delay with advanced 2.4GHz tech, slashing latency to just 30ms for flawless sound sync.
RELIABLE LONG RANGE PERFORMANCE - Enjoy stable wireless audio transmission up to 100 feet, even through walls—ideal for large spaces and multi-room setups.
MASSIVE MULTI DEVICE CONNECTIVITY - Scale effortlessly with up to 100 receivers on a single transmitter—perfect for group listening or professional setups.

The Avantree Audiplex is a scalable wireless audio transmitter and receiver system designed for professional and personal multi-listener environments. Supporting up to 100 receivers, it delivers ultra-low latency (30ms) audio over 2.4GHz with universal AUX and optical compatibility. Each receiver features individual volume controls and offers a reliable 100-foot range, making it ideal for home theaters, PA systems, assistive listening, and group audio experiences.

Specifications

ASIN	B095CDP58W
Additional Features	audio bitrate/sampling rate: 16bit/48khz
Audio Output Mode	Stereo
Audio Output Type	auxiliary, optical
Battery Charge Time	2 Hours
Battery Type	Lithium-Polymer
Battery Weight	14 Grams
Best Sellers Rank	#130,190 in Electronics ( See Top 100 in Electronics ) #201 in Audio Component Receivers
Bluetooth support?	No
Brand	Avantree
Built-In Media	Transmitter X 1 Receiver X 3 USB A to Type C Charging Cable X 1 (1.5M/5FT) 3 in 1 USB A to Type C Charging Cable X 1 (60CM/2FT) Optical Audio Cable X 1 (1.5M/5FT) AUX 3.5mm Audio Cable X 1 (1.5M/5FT) AUX 3.5mm to RCA Audio Cable X 1 (35CM/1FT) Wired Earbuds X 3 (75CM/2.5FT) Attachment Clip X 3
Color	Black
Compatible Devices	Optical / AUX Devices – TVs, mixers, laptops, microphones
Connectivity Technology	Wireless
Connector Type Used on Cable	AUX or Optical
Control Method	Touch
Control Type	Volume Control
Controller Type	Button Control
Customer Reviews	4.3 4.3 out of 5 stars (177)
Enclosure Material	Aluminum
Hardware Interface	Radio Frequency
Human Interface Input	Touchscreen
Includes Remote	No
Item Dimensions L x W x H	4.49"L x 2.95"W x 1.18"H
Item Weight	318 Grams
Lithium Battery Weight	0.8 Grams
Lithium-Battery Energy Content	0.8 Watt Hours
Manufacturer	Avantree
Model Name	WSTR-2403-S
Number of Batteries	4 Lithium Polymer batteries required. (included)
Number of Channels	2
Number of Lithium-ion Cells	1
Power Source	Battery Powered
Rechargeable Battery Included	Yes
Warranty Description	Warranty - 12 months (extend to 24 months with product registration) \| Extensive Support: Chat, Email, Phone, Online Clinic, Video Tutorials, FAQ and Registration - avantree.com/support
Wireless Compability	2.4 GHz Radio Frequency

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