Are these plug and play? Even if you have a single horn now?

If you have a single horn, you'll have to make or buy a harness that has connections for two horns. It's really simple to do. These horns are 1.5 amps each if I'm not mistaken, using 3 amps when sounded. If the draw isn't significantly higher than your stock horn is, then you should be fine without having to modify the electrical system other than the split harness.

can this horn be fixed on a bicycle?

You can but the horn needs a battery

Would this work for a Wr250r?

It works for 12 volt systems. It is fairly small. Check the dimensions of your horn to confirm.

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HELLA 012588011 Motorcycle Series Black 12V Disc Horn Kit (Universal Fit-Set/Box)

Product ID: 32044724

Details

Brand
Hella
Color
Black
Item dimensions L x W x H
7.09 x 2.76 x
Material
Alloy Steel
Voltage
12 volts

🔊108 dB piercing sound

⚙️Universal 12V fit

🛠️Durable alloy & stainless steel

¥10500

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Description

🔔 Be heard, be safe — the horn that commands the road!

BUILT TO ENDURE - Crafted from alloy steel and stainless steel for long-lasting performance in all weather conditions.
PLUG PLAY UNIVERSAL FIT - 12V compatibility with M8 screw bracket ensures seamless installation on most motorcycles and cars.
TRUSTED GERMAN ENGINEERING - Over 100 years of precision technology guarantees reliability and OEM-level quality.
COMMAND ATTENTION INSTANTLY - 108 dB loud, penetrating sound cuts through traffic noise for ultimate safety.
ELEVATE YOUR RIDES SAFETY - Distinctive dual-tone horn ensures you’re heard loud and clear, reducing road risks.

The HELLA 012588011 Motorcycle Series Black 12V Disc Horn Kit delivers a powerful 108 dB sound with a universal 12V fit, engineered from durable alloy and stainless steel. Backed by over a century of German precision, this horn ensures superior safety and reliability for motorcycles and passenger cars alike.

Specifications

ASIN	B01EG18SDE
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#45,273 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #20 in Bike Horns
Brand Name	Hella
Color	Black
Compatible with Vehicle Type	Motorcycle, Passenger Car
Customer Reviews	4.4 4.4 out of 5 stars (733)
Fit Type	Vehicle Specific Fit
Global Trade Identification Number	04082300548648
Included Components	Horn
Item Dimensions	7.09 x 2.76 x 2.76 inches
Item Type Name	Horn Kit
Item Weight	8.8 ounces
Manufacturer	HELLA
Manufacturer Part Number	3AL 012 588-011
Manufacturer Warranty Description	Limited 1 Year
Material Type	Alloy Steel, Plastic, Stainless Steel
Model Number	012588011
Noise Level	108 db
Number of Items	1
Number of Packs	1
OEM Equivalent Part Number	1 243 710-BMW,1 358 772-BMW,1 358 773-BMW,1 459 152-BMW,1S6-H3371-00-YAMAHA,1VJ-83371-00-YAMAHA,2 346 423-BMW,27003-0028-KAWASAKI,27003-0073-KAWASAKI,27003-0084-KAWASAKI,27003-0085-KAWASAKI,27003-0086-KAWASAKI,27003-1347-KAWASAKI,27003-1405-KAWASAKI,34B-83371-00-YAMAHA,3810-MC7-611-HONDA,38100-124-721-HONDA,38110-147-004-HONDA,38110-GS-013-HONDA,38110-KW3-008-HONDA,38120-KCZ-J71-HONDA,38120-MBZ-K0…
Style Name	High & Low Tone / 12 V
Unit Count	1 Count
Voltage	12 volts

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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¥10500

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

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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The delivery time was excellent, and the packaging was secure.

2 months ago

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