A quick ding on this iron bell lets pedestrians and other riders know that you're passing. Loud enough to get the attention of the pedestrians. have a nice shiny look. With 6 different and loud sounds increase the safety. Sound button is very comfortable and sensitive. Water resistant design so also can be used on rainy day. DX official video of this product: Normal 0 7.8 ? 0 2 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:????; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} http://www.youtube.com/watch?v=LPoHgV3vXyc - Easy on-off mounting - Integrated bike mount - 6 different sound effects when press the power switch - 100db loud electronic signal penetrates traffic noise - Lightweight and impact resistant - Weather resistant - Control cable length: 20cm - Powered by 1*6F22 9V battery (included)