Type: Electric Horn Size: 3.5 * 3 cm Material: Silica gel Model Number: CB1709 Certification: ce Brand Name: ROCKBROS Weight : 33 g Battery: Button cell Decibel: 110 dB Sound: 3 Voices Color: Black / green/ red/blue Waterproof level: IPX4 Feature: Rainproof Name: Electric Cycling Bells Bicycle Handlebar Bell