Specifications: Battery Capacity: USB chargable 800mAh(3.7V) Lithium battery Charging 2-3hours, using up to 15 days, up to 60 days standby arming Light Beads: COB bright light source The A (red key) is for Flash Model Switch The B (blue key) is the Calibration code key for reset the light to be functional again when it is needed Remote Control Battery: 12V/27A Alkaline Battery Alarm Sound: 105-120db Remote Control Distance: 10-50m(Open Diastance), can pass through the wall Applicable Models: normal installation is for bicycle saddle bracket with distance 5-7cm(Any bike models and sizes) Material: Plastic Color: Black Quantity: 1 Set Package includesaaLs 1 set Alarm System 1 X Manual Easy and convenient to install.When an alarm is locked, it is sensitive to vibrations Protect your bicycle from crafty thefts.Utilize vibration sensor for detection Instantly produce super loud alert sound to scare the thief away when certain vibration is detected Attached with a remote control for added convenience.Convenient clip mount, easily install to the bicycle handlebar.Solid casing is durable for long-lasting use Available for use when the distance between remote control and alarm is within 10-50m(Open diastance), can pass through the wall