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

Product ID: 258510384

Details

Brand
HELLA
Colour
Black
Item dimensions L x W x H
18 x 7 x 7
Material
Horn
Voltage
12 Volts

⚡12V universal voltage

🎯Dual-tone 480Hz & 380Hz

🔊108 dB sound level

¥3970

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Description

🔔 Own the road with sound that demands respect!

TRUSTED LEGACY - From HELLA, a century-strong leader in automotive tech ensuring premium quality.
DUAL TONE PRECISION - High (480 Hz) and low (380 Hz) tones create a unique, unmistakable alert.
COMPACT DURABLE DESIGN - Sleek black finish with robust plastic housing built to last on every ride.
COMMAND ATTENTION INSTANTLY - 108 dB piercing sound cuts through highway noise for ultimate safety.
UNIVERSAL 12 V COMPATIBILITY - Fits virtually any motorcycle with a hassle-free installation.

The Hella 012588011 Motorcycle Series Black 12V Disc Horn Kit delivers a powerful 108 dB dual-tone alert (480 Hz high, 380 Hz low) designed for universal motorcycle fit. Compact and durable, it features a sleek black design with easy M8 screw mounting and blade-type connectors. Backed by HELLA’s 100+ years of automotive expertise, this horn ensures maximum safety and attention on the road.

Specifications

ASIN	B01EG18SDE
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#4,155 in Automotive ( See Top 100 in Automotive ) #3 in Automotive Horns #5 in Automotive Horns & Accessories
Brand Name	HELLA
Color	Black
Compatible with Vehicle Type	Motorcycle
Country of Publication	China
Customer Reviews	4.3 4.3 out of 5 stars (716)
Fit Type	Vehicle Specific Fit
Global Trade Identification Number	04082300548648
Included Components	Horn
Item Dimensions	18 x 7 x 7 centimeters
Item Type Name	Horn Kit
Item Weight	0.55 Pounds
Manufacturer	HELLA
Manufacturer Part Number	3AL 012 588-011
Manufacturer Warranty Description	Limited 1 Year
Material Type	Horn
Model Number	012588011
Noise Level	108 Decibels
Number of Items	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
Voltage	12 Volts

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¥3970

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.

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TrustScore 4.5 | 7,300+ reviews

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