Is this the same as piaa 85115, and if so why the different part number ho-9?

This is Japanese version. All instruction in Japanese.

What does piaa [peer] mean. peer suggests equal. is this a copy of the pia product?

PIAA is the name of a Japanese company specializing in automotive equipment. They make a variety of automative accessories including car horns: https://www.piaa.co.jp/category/english/e_4rin/e_horn/#400-500hz-sports-horn Don't know of any relationship to PIA as you stated in your question. I installed the horns on my Polaris Slingshot replacing the single horn that came with the vehicle. The sound is much louder and richer than the original one due to the dual horns set at different frequencies of 400Hz and 500Hz. Well-satisfied with the results. Hope this helps.

do it come with the adapter wire ?

They come with wires and connectors. I am not sure what you mean by adapters. You simply plug the existing wire from your auto onto one horn and use the accompanying wires to connect the second horn to the first. Then ground the second horn to complete the circuit. It is all very simple and easy.

will this work on motorcycle?

No, this don't work on motorcycle.

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[pair] sport horn 330+400HZ [number] HO-9

Product ID: 402434120

Details

Brand
Piaa
Colour
Black
Fit type
Universal Fit
Material
Plastic
Voltage
12 Volts

⚡12V universal fit

🎵Dual-tone 330 Hz + 400 Hz

🔊112 dB super loud

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Description

🎯 Make your presence heard with the ultimate bass blast!

DUAL TONE DEEP BASS HARMONY - Experience a rich blend of 330 Hz and 400 Hz frequencies for a uniquely powerful sound.
UNIVERSAL 12 V COMPATIBILITY - Seamlessly fits most passenger vehicles without hassle.
SLEEK SWIRL DESIGN FROM JAPAN - Elevate your ride’s style with a premium, compact horn crafted for performance and aesthetics.
COMPLETE INSTALLATION KIT INCLUDED - Earth harness included for quick, professional-grade setup.
COMMAND ATTENTION WITH 112 D B POWER - Cut through city noise with a horn that demands respect.

The PIAA HO-9 Horn delivers a commanding 112 dB sound output with a unique dual-tone frequency of 330 Hz and 400 Hz, engineered for deep bass impact. Designed for universal 12V vehicle compatibility, it includes an earth harness for easy installation. Compact and stylish with a swirl design, this Japanese-made horn is perfect for drivers who want to stand out audibly and visually while meeting vehicle inspection standards.

Specifications

ASIN	B004VJMYD2
Automotive Fit Type	Universal Fit
Best Sellers Rank	#13,732 in Automotive ( See Top 100 in Automotive ) #14 in Musical Horns
Brand	Piaa
Brand Name	Piaa
Color	Black
Colour	Black
Compatible with Vehicle Type	Passenger Car
Customer Reviews	4.4 out of 5 stars 934 Reviews
Fit Type	Universal Fit
Fit type	Universal Fit
Included Components	Earth Harness
Item Type Name	car horn
Manufacturer	PIAA(ピア)
Manufacturer Part Number	HO-9
Material	Plastic
Material Type	Plastic
Model Number	HO-9
Noise Level	112 Decibels
Number of Items	2
OEM Equivalent Part Number	HO-9
Style	Super Bass / Swirl
Style Name	Super Bass / Swirl
Voltage	12 Volts

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