Powerful Waterproof: The super loud bicycle horn can also be used in rainy days. It is rain-proof, waterproof and rust-proof. The ringtone is still clear and loud in rainy days, so you are not afraid of riding in rainy days.
300mAh Button Battery: The bike horn comes with 2 button batteries, the battery voltage is 3V. After experiments, it can be used for 200 days and can ring 5000 times. So you don't need to change the battery frequently.