Description:<br /><br /> 100% brand new and high qualilty, fashion design..<br /><br /> Easy installation, can be attached to most of bicycle.<br /><br /> Each powered by 3 x AAA battery (Not included), install correctly according to instruction.<br /> Three different thickness of gaskets included for you to choose.<br /> Combine two functions, bell and alarm.<br /><br /> Color: Silver&amp;amp;Black<br /><br /> Weight: 400g<br /><br />  <br /><br /> Function Introduction:<br /><br /> 1.Password Setting:<br /><br /> -Install the batteries, when LED light flash automatically, input four number,then you will hear Bi-bi-bi-bi if you input successfully and LED light will stop  flashing.<br /><br /> 2.Password Change:<br /><br /> -In non-security mode, press button &amp;quot;F&amp;quot; and input the original password, then you will hear Bi-bi-bi-bi.<br /><br /> -The red light will steady on for 5 seconds, then input a new four number password in this five seconds. Set successfully when hear Bi-bi-bi-bi again, and the red light stop flashing.<br /><br /> - If set fail, please repeat the above steps.<br /><br /> 3.Security Setting:<br /><br /> -Press button &amp;quot;F&amp;quot; twice, you will hear Di-du. Red LED flash and it will enter the alert mode within 5 seconds. <br /><br /> -It will beep Bi-bi once when dectect vibration, and keep alarming for 30 seconds if detect vibration again.<br /><br /> 4.Usage of bell:<br /><br /> -Press button 1, 2, 3 randomly to ring in non-security mode.<br /> <br /> Note:<br /> Tubu diameter should between 2cm to 3cm.<br /><br />  <br /><br /> Package Included:<br /><br /> 1 x Electric Bell Headlight<br /><br /> 3 x Gasket<br /><br /> <br /> Piuture Details: