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: 274726082

Details

Brand
Yaesu Vertex
Connector type
Auxiliary
Cable type
AUX
Compatible devices
Radio
Special features
Waterproof

💧Waterproof design for rugged outdoor use

🔌6-pin AUX connector for seamless compatibility

🎙️Dual jack adapter splits speaker & mic signals

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¥6805

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Description

🎧 Elevate your comms game with flawless audio clarity and rugged reliability!

COMPACT DISCREET - Sleek black round design blends seamlessly with your professional radio gear
RUGGED WATERPROOF BUILD - Engineered to withstand outdoor conditions, ensuring reliable performance in any environment
UNIVERSAL COMPATIBILITY - Fits a wide range of Yaesu, Vertex, Standard, and Alinco radios for ultimate versatility
PLUG AND PLAY CONVENIENCE - Male-to-female AUX connector enables quick, hassle-free setup without extra tools
PRECISION AUDIO SEPARATION - Transforms a single speakermic jack into dedicated speaker and microphone ports for crystal-clear communication

The Yaesu Vertex/Standard Horizon CT-91 Speaker Microphone Adapter is a waterproof, 6-pin AUX connector that converts a single speakermic jack into separate speaker and microphone jacks. Compatible with a broad range of handheld radios from Yaesu, Vertex, Standard, and Alinco, it ensures crystal-clear audio separation and reliable outdoor performance for professional-grade communication.

Specifications

ASIN	B0049GXLDY
Brand	Yaesu Vertex
Brand Name	Yaesu Vertex
Cable Type	AUX
Cable type	AUX
Color	Black
Compatible Devices	Radio
Compatible devices	Radio
Connector Gender	Male-to-Female
Connector Type	Auxiliary
Connector type	Auxiliary
Included Components	Microphone
Indoor Outdoor Usage	Outdoor
Item Shape	Round
Manufacturer	Yaesu Vertex Standard
Model	CT-91
Model Name	Horizon CT 91
Number of Pins	6
Other Special Features of the Product	Waterproof
Recommended Uses For Product	Radio
Recommended uses for product	Radio
Special features	Waterproof
Specification Met	UL
UPC	788026085279
Unit Count	1.0 Count

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¥6805

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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