can this be used to connect an external speaker while in the car?

Yes, it separates the single speakermike jack of compatible models, into separate speaker and mic jacks.

Will it work on standard horizon hx400is?

It should. It appears the adapter plug and the plug on the HX400is hand microphone are the same.

Is this compatible to connect my yaesu FT-270R to kenwood/baofeng 2 pin connectors on speaker/mics and headsets?

Yes, some 2-pin "Icom" style speakermics "may" work thru this adapter, but at that point I would suggest getting the correct Speakermic - either the MH-57A4b, the CMP460 , or the MH-73A4B, no need for adapter.

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Yaesu Vertex/Standard Horizon CT-91 Speaker Microphone Adapter

Product ID: 9614886

Details

Brand
Yaesu Vertex
Cable Type
AUX
Compatible Devices
Radio
Connector Type
Auxiliary
Special Feature
Waterproof

💧Waterproof design

📻Compatible with 15+ radio models

🔌Dual jack adapter

4965 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Connect like a pro, talk like a boss.

PLUG PLAY CONVENIENCE - Simple male-to-female AUX connector ensures quick setup without any technical hassle.
RUGGED WATERPROOF BUILD - Engineered to withstand outdoor and indoor environments, keeping your connection crystal clear rain or shine.
COMPACT DURABLE DESIGN - Sleek black finish with protective tubing packaging for longevity and professional aesthetics.
BROAD RADIO COMPATIBILITY - Works flawlessly with top Yaesu, Vertex, Standard, and Alinco handheld radios—never worry about compatibility again.
SEAMLESS DUAL JACK CONVERSION - Transforms a single speakermic jack into separate speaker and mic jacks for ultimate flexibility.

The Yaesu Vertex/Standard Horizon CT-91 Speaker Microphone Adapter converts a single speakermic jack into separate speaker and microphone jacks, compatible with a wide range of popular handheld radios including Yaesu VX and Standard models. Its waterproof, durable design ensures reliable performance in both indoor and outdoor settings, making it an essential accessory for professionals who demand clear communication on the go.

Specifications

ASIN	B0049GXLDY
Best Sellers Rank	#57,709 in Musical Instruments ( See Top 100 in Musical Instruments ) #1,755 in Microphone Cables #2,141 in Two-Way Radio Headsets & Microphones
Brand Name	Yaesu Vertex
Cable Type	AUX
Color	Black
Compatible Devices	Radio
Connector Gender	Male-to-Female
Connector Type	Auxiliary
Customer Package Type	sealed anti-static bag or coiled in protective tubing
Customer Reviews	4.1 4.1 out of 5 stars (83)
Included Components	Microphone
Indoor Outdoor Usage	Indoor, Outdoor
Item Shape	Round
Manufacturer	Yaesu Vertex Standard
Model	CT-91
Model Name	Horizon CT 91
Number of Items	1
Number of Pins	4
Other Special Features of the Product	Waterproof
Outer Material	Other
Part Number	CT-91
Recommended Uses For Product	radio
Specification Met	UL
UPC	788026085279
Unit Count	1 Count

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