Refillable, extra-loud air horn for city cycling - $25.99

"A fantastic and immensely loud bicycle horn."

• Yes, it's an AIR HORN for your bicycle
• Alert cars, trucks and turning vehicles that you are sharing the road
• Refillable air reservoir slips into water bottle holder, or attaches to frame
• Recharge with a bike pump
• Doesn't require batteries or air cartridges
• Mounts on handlebars for fingertip control
• Adjustable volume control for vehicles (roads) and pedestrians (shared paths)
• Weighs under 100 grams
• Designed by a Canadian
• Also useful for back-country trails and rural roads (bears and logging trucks)