Too small to plug into my Fischer stereo headphone jack. Is this able to make my stereo bluetooth? And what do i need if so.

The headphone jack is an output, not an input: This device only RECEIVES from bluetooth devices like a phone or TV or etc. So if you want to play music from a phone through your stereo, this will work. If there is no 3.5mm INPUT on your stereo, you will need an adaptor cord with a 3.5mm plug on one end (to plug into this), and RCA jacks on the other end for the stereo AUX input or CD input, or etc. on your Fischer (or most any brand) amp or receiver. You also might want a spare USB charger to leave connected to this device so that it'll never die while in use for needing a charge. If you want to send music from your stereo to bluetooth headphones, you'll need a device that SENDS/TRANSMITS bluetooth from your headphone jack using a 3.5mm to 1/4" adaptor. Many choices on Amazon.

Can it be charged while in use, and is there a loss of sound if it can?

Yes, however I find if I’m using ANC then charging produces a very loud buzz. But charging and listening works fine if ANC is off.

I lost the instructions that came with this. How do I pair it to my phone?

Hold down the center button, the one with a phone icon. That puts it into pairing mode.

Does this work with Chromecast? The sound comes out of my speakers on the monitor. I want to keep them wireless and not use a cable.

Chromecast is already Bluetooth capable. This device would allow the use of a wired connection, so it seems it is not the way you want to go.

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Bluetooth V5.0 Receiver, Mini Wireless Bluetooth 3.5mm Jack Aux Adapter Portable Bluetooth Stereo Output Audio Receiver for Headphones, Speakers, Car/Home Stereo System(Black)

Bluetooth V5.0 Receiver, Mini Wireless Bluetooth 3.5mm Jack Aux Adapter Portable Bluetooth Stereo Output Audio Receiver for Headphones, Speakers, Car/Home Stereo System(Black)

Product ID: 335930797

Details

Special features
Built-In Calls
Brand
KINDRM
Connectivity technology
AUX
Power source
Battery
Product dimensions
15L x 15W x

🎧Dual device pairing for seamless multitasking

📶Bluetooth 5.0 for stable, fast connection

🔋1.5-hour quick charge with long playtime

Description

🎵 Cut the cords, not the vibe — wireless freedom in your pocket!

DUAL DEVICE PAIRING - Connect two Bluetooth devices simultaneously—never miss a call or a beat.
PLUG PLAY SIMPLICITY - Instantly upgrade any 3.5mm aux device to wireless with intuitive controls.
COMPACT CLIP ON DESIGN - Take your music anywhere with a sleek, portable receiver that clips on effortlessly.
HANDS FREE CALLING WITH HD MIC - Crystal-clear calls and easy Siri activation keep you connected on the go.
SEAMLESS BLUETOOTH 5 0 CONNECTIVITY - Experience ultra-stable, low-latency wireless audio up to 33 feet away.

This Bluetooth V5.0 Receiver transforms any 3.5mm aux audio device into a wireless powerhouse with up to 33 feet range, dual device connectivity, and a built-in HD microphone for hands-free calls. Its compact clip design and quick 1.5-hour charging make it perfect for on-the-go professionals seeking seamless audio upgrades without the hassle of cables.

Specifications

ASIN	B07Z9X3397
Additional Features	Built-In Microphone, Hands-Free Calls
Audio Input	3.5mm AUX
Audio Output Mode	Stereo
Audio Output Type	Speaker
Battery Charge Time	1.5 Hours
Battery Type	Lithium-Polymer
Battery Weight	3.5 Grams
Best Sellers Rank	#76,274 in Electronics ( See Top 100 in Electronics ) #345 in Wireless Audio Receivers & Adapters
Bluetooth support?	Yes
Brand	KINDRM
Color	Black
Compatibility Options	[Inferred] 3.5mm auxiliary input or Bluetooth capable devices
Connectivity Technology	Auxiliary , Bluetooth
Connector Type Used on Cable	Auxiliary
Control Method	Voice
Controller Type	HomeKit
Customer Reviews	4.0 out of 5 stars 2,423 Reviews
Enclosure Material	Plastic
Hardware Interface	Bluetooth, Bluetooth 5
Includes Remote	No
Installation Type	Portable
Item Dimensions L x W x H	0.59"L x 0.59"W x 2.28"H
Item Weight	0.02 Kilograms
Lithium Battery Weight	0.5 Grams
Lithium-Battery Energy Content	0.26 Watt Hours
Lithium-Battery Voltage	3.7 Volts
Manufacturer	Ningbo Gecen Promotion & Gift Co., Ltd/KINDRM
Material	Plastic
Number of Batteries	1 Lithium Polymer batteries required. (included)
Number of Channels	2
Number of Lithium-ion Cells	1
Power Source	Corded Electric
Product Dimensions	0.59"L x 0.59"W x 2.28"H
Rechargeable Battery Included	Yes
Special Feature	Built-In Microphone, Hands-Free Calls
Supported Application	Spotify, YouTube, MP3, AAC
Supported Media Type	TypicalBluetoothAudioFormats
Supported Standards	Bluetooth 5.0 + EDR
UPC	781545641063
Voltage	3.7 Volts
Wireless Compability	Bluetooth

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