What i think i am seeing in the picture is two different converters. is one a straight through gender changer & the other a null modem configuration?

Both of them are standard null modem adapters

Will these pass sound so that I may plug in my Bose speakers?

not sure your application, this is an RS232 signal swap adapter. Here is pinout: pin-1 goes to pin-4, pin-2 to pin-3, pin-5 to pin-5, pin-7 to pin-8, and pins-6&9 are not connected.

Hi, are both of these the exact same? If not what is the difference?

I ordered a 2 pack for work and they are the same.

DB9 null modem male to female slimline data transfer serial port adapter 2 Pack

Product ID: 294764340

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Details

Colour
2 Pack
Compatible devices
Modem
Connector type
DB9
Item dimensions L x W x H
33 x 13 x 2
Specific uses for product
PC Laptop

📏Slimline design reduces port strain

🔌DB9 male to female adapter

🔥UL 94V-0 flame-retardant insulator

Description

🔗 Slim, safe, and savvy—connect like a pro with DB9 null modem adapters!

TRUSTED BY PROS - Join 1,176+ satisfied users who rate it 4.7 stars for reliable, high-performance serial communication.
ULTRA SLIM PROFILE - Compact design minimizes leverage strain on your laptop or PC ports—no more bulky adapters sticking out.
PREMIUM SAFETY CERTIFIED - Built with UL 94V-0 rated insulators ensuring top-tier flame resistance and durability.
VERSATILE USER FRIENDLY - Removable, reversible screws for easy installation and secure connections every time.
SEAMLESS NULL MODEM CONVERSION - Effortlessly transform straight cables into null modem with open pin 9 wiring for flawless data transfer.

The Arnorin DB9 null modem adapter 2-pack converts standard straight-wired serial cables into null modem configurations with an open pin 9, enabling seamless data transfer. Its slimline design reduces port strain, while UL 94V-0 flame-retardant insulators ensure safety and durability. Featuring removable and reversible screws, these adapters offer easy installation and secure connections, making them a top-rated choice for professional-grade serial communication.

Specifications

ASIN	B075XHWVSJ
Best Sellers Rank	#25,870 in Computers ( See Top 100 in Computers ) #58 in Serial Adapters
Brand	Arnorin
Color	2 Pack
Compatible Devices	Modem
Connector Type	DB9
Customer Reviews	4.7 4.7 out of 5 stars (1,176)
External Testing Certification	Não aplicável
Finish	Gold
Input Voltage	9 Volts
Item Dimensions	33 x 13 x 2 millimeters
Manufacturer	Arnorin
Model Number	KAD9D90001-S-2
Number of Items	2
Number of Ports	2
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	PC, Laptop
UPC	613852966235
Unit Count	2.0 Count
Warranty Type	Limited

Reviews

J**E

Works very well for what I needed. I like the smaller size compared to the others I have that stick out so far.

26.05.2021

G**U

As described.

26.01.2026

C**C

La idea era eliminar el cable null modem y funciona bien inicialmente. Lo recomiendo.

9.06.2020

F**O

Llegó en tiempo y forma

10.04.2025

M**S

All connectors worked, and just bought a second pack. Seller very responsive and helpful.

24.05.2018

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