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: 50720450

Details

Brand
Yaesu Vertex
Cable type
AUX
Compatible devices
Radio
Special feature
Waterproof
Recommended uses for product
Radio

💧Waterproof design

🔌4-pin AUX connector

🎙️Dual speaker & mic jack adapter

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$143

Duties & taxes included

In stock

Sold byAmazon FijiDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎧 Stay connected, rain or shine—upgrade your radio game with CT-91!

TRUSTED BY PROS - Highly rated with 5-star reviews, this adapter is the go-to choice for serious radio users.
PLUG PLAY SIMPLICITY - Male-to-female AUX connector ensures quick, hassle-free setup—get back to what matters faster.
RUGGED WATERPROOF BUILD - Engineered to withstand outdoor conditions, keeping your communication crystal clear rain or shine.
BROAD RADIO COMPATIBILITY - Works flawlessly with top Yaesu, Vertex, Standard, and Alinco handheld radios—never worry about fit.
SEAMLESS DUAL JACK CONVERSION - Transforms single speakermic jack into separate speaker and mic ports 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 handheld radios including Yaesu VX and Standard models. Featuring a rugged, waterproof design and a 4-pin AUX male-to-female connector, it ensures reliable outdoor communication with easy plug-and-play installation.

Specifications

ASIN	B0049GXLDY
Brand	Yaesu Vertex
Cable Type	AUX
Cable type	AUX
Colour	Black
Compatible Devices	Radio
Compatible devices	Radio
Connector Gender	Male-to-Female
Connector Type	Auxiliary
Connector type	Auxiliary
Customer Package Type	sealed anti-static bag or coiled in protective tubing
Customer Reviews	5.0 out of 5 stars 4 Reviews
Indoor Outdoor Usage	Outdoor
Item Shape	Round
Manufacturer	Yaesu Vertex Standard
Model Name	Horizon CT 91
Model Number	CT-91
Number of Items	1
Number of Pins	4
Other Special Features of the Product	Waterproof
Outer Material	Other
Recommended Uses For Product	Radio
Recommended uses for product	Radio
Special feature	Waterproof
Specification Met	UL
UPC	788026085279
Unit Count	1.0 Count

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