Ideal for: Suitable for bicycle, car, motorcycle, electric bike, self-balancing scooter, doors and windows. Multi-function alarm: Mainly works as an anti-theft alarm, also has vehicle alarm Search and one-way SOS functions. Super loud: Once activated, a super loud 113db alarm will be an effective deterrent and can effectively scare away bicycle thieves. Waterproof. : Waterproof rating up to IP55, can be used outdoors. Adjustable Sensitivity: There are 7 sensitivity levels, corresponding to 7 tones (don't forget) "Do" is the highest and default sensitivity level. Product Description Main Functions Arm and disarm Touch sensitivity adjustment Select the doorbell sound. One-key vehicle lock. SOS Functions Low battery indication Wide Application: With its sturdy and durable housing, it is waterproof and dustproof and very suitable for outdoor use. It is widely used in bicycles, electric bicycles, motorcycles and scooters, doors and windows.