Ideal for night shift workers, elderly, disabled, joggers, and those  traveling alone,protect yourself against  intruders/attackers.<br />In case of emergency, pull out key-ring  metal pin to activate siren（120db) and draw attention of police or passerby.<br />When key-ring metal pin is inserted back  into the alarm, it will stop sounding<br />To change battery: When the alarm sound  goes low, please remove screws from back cover and replace 1 x 23 mA 12 V battery.<br />Warning: The alarm  sound is very loud, never put the unit close to your ears.<br /><br />Size (L x W x H) : Approx. 5 x 4 x 1.5 cm / 2.0 x 1.6 x 0.6"<br />Key chain length : 2 cm<br />Color : White<br />Powered by 1 x 23 mA 12V battery ( not included )<br />Siren Alarm*1 <br />Original Package<br /><img src="http://img6.eachbuyer.com/x9/p100/cq455_1.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq455_2.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq455_3.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq455_4.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq455_5.jpg" />                                                        <img src="http://img6.eachbuyer.com/x9/p100/cq455_6.jpg" />