Electromagnetic Horns Brand new Two tone 1 Set comes with 2 pieces. 12V 400/500Hz, 118dB Increase noise to sound like a car. Great for when someone is about to merge into your lane without knowing you're there. I've been cut off many times and half of them my horn had no effect. 1. Strong Sound - Audible Safety - Always Strong & Clear Tone 2. Long Life & Reliability - Membrance Filter Technology for increased performance and protection against corrosion, dirt & humidity 3. OE Quality - Homologated according to ECE standard and designed according to OE specifications 4. For Motorcycles - Optical performance in Urban & Overland traffic With German E1 Approvals Price: $20 [/URL] [/URL] It's not that big, I could fit both in my super sports.