Features1High-Volume: Bicycle electric horn, 80-130dB 3 level volumes adjustable, effectively reminds the surrounding pedestrians and vehicles, making riding safer. 2AntiTheft: Sensitive trigger, turn on the antitheft alarm function, when someone moves the bicycle, the horn will send out an alarm reminder. 3Long Endurance: Built-in large-capacity battery, low power consumption and long endurance, support powered by PC/laptop, USB hub, etc. 4Personalized Setting: Equipped with 4 sound modes, whistles/horn/alarm/beep, one-key switching to meet your different needs. 5Reliable Quality: High-quality PC and ABS housing with nice durability, sturdy and wear-resistant. IPX6 waterproof, no fear of bad weather outdoors. 6Easy to Use: Small and lightweight, easy to install, suitable for handlebars with a diameter of 22.2-32mm. With quick release design, saving time and effort.SpecificationFeatures:High-Volume: Bicycle electric horn, 80-130dB 3 level volumes adjustable, effectively reminds the surrounding pedestrians and vehicles, making riding safer.AntiTheft: Sensitive trigger, turn on the antitheft alarm function, when someone moves the bicycle, the horn will send out an alarm reminder.Long Endurance: Built-in large-capacity battery, low power consumption and long endurance, support powered by PC/laptop, USB hub, etc.Personalized Setting: Equipped with 4 sound modes, whistles/horn/alarm/beep, one-key switching to meet your different needs.Reliable Quality: High-quality PC and ABS housing with nice durability, sturdy and wear-resistant. IPX6 waterproof, no fear of bad weather outdoors.Easy to Use: Small and lightweight, easy to install, suitable for handlebars with a diameter of 22.2-32mm. With quick release design, saving time and effort.Specifications:Model: With 1 Sound Mode / With 4 Sound Modes(optional)Color: BlackMaterial: ABS + PCDecibel: 80-130dBInput Power: 5V-200mABattery: Built-in 250mAh Lithium BatteryWaterproof: IPX6Item Size: 43.3 * 22.1 * 86.7mm/ 1.7 * 0.8 * 3.4inPackage Size: 150 * 100 * 50mm/ 5.9 * 3.9 * 2.0inPackage Weight: 60g/ 2.1ozPacking List:1 * Bike Bell1 * USB CablePackage List1 * Bike Bell1 * USB Cable