PIAA OTO 音 Style Horn 400Hz/500Hz 
PIAA OTO HORN is designed for use with 12v automotive and motorcycle electrical systems only. Install the horn to an angle the horn's opening section faces down. Do not install the horn to a location where temperature exceeds 60°C (140°F). Install PIAA horn at the same location as original factory horn.

OTO translated as “Sound” in Japanese, the OTO Style Horn is built to the same high-quality standards as other PIAA horns, but at a more affordable price point. 
112Db. Loud and Attention attracting.
Water and Dust proof design.
Slim design. Easy to fit.
Meeting PIAA Standard:> 1000,000 sound durability test.
Double longer life compared to European ECE standard.
PIAA Sticker included to customize style.

PIAA OTO Style Horn: Unboxing, Sound Comparison 
https://youtu.be/KgK7CY5fGLQ