Power: 9V battery (product without battery)<br />Method of use: press the red button? A will fortify pip; press B key to cancel the alarm will be gray? toot twice. Super loud? easy to operate? easy to guard against theft; short time to leave the bike? and then do not bother to lock the<br /><img src="http://img6.eachbuyer.com/x9/p100/eb04262_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb04262_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb04262_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb04262_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb04262_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/eb04262_6.jpg" />