Feature 1Anti Theft: The system has a flashing and alarm function that can warn motorcycle riders and prevent others from stealing. 2Retrofit Speaker: The MP3 anti theft alarm can also be used as a retrofit speaker to provide excellent sound for a more wonderful ride. 3Practical Design: The motorcycle anti theft alarm has powerful functions to connect Bluetooth and SD card to meet various riding needs. 4Stable and Reliable: The frequency response range of the alarm audio is 100Hz6KHz, the stable signal provides you with a reliable use experience. 5Performance: The anti theft system is made of durable aluminum material, very lightweight and easy to install without much technical support.Item Type:MotorcycleAntiTheftSpeakerSystemMaterial: AluminiumProduct Size: Approx: 9x7x7cm/3.54x2.75x2.75inFrequency Response Range: 100Hz-6KHzBattery Type: Lithium battery(Shipped with built in battery, without TF card)Battery Capacity: 120mah .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List2 x Motorcycle MP3 Anti Theft Audio1 x Motorcycle MP3 Audio1 x Power Cord2 x Iron Piece8 x Screws1 x Control SwitchNote1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.