grass break alarm 125db ultra-slim anti-theft window grass break detector alarm for home vibration sensor alert with adjustable sensitivities (3 pcs) evernary <ul><li>evernary window alarm perfect for securing your windows and doors. its sensor detects vibration and emits a 125 db alarm and led flashing to alert you of a potential break-in or glass break.the alarm and led flashing will stop after 30 seconds or turn off the power switch.</li><li>roller ajustment vibration sensor sensitivities can help to prevent false alarms.</li><li>alarm device with on/off button,easy to turn it off when you don't need it alarm.</li><li>the ultra-thin (0.35 inches)design of this alarm makes it perfect for use with any windows.</li> <li>easy to install, simply peel and stick the alarm to any windows or glass.</li><li>low battery indicator alert you replace the batteries.</li></ul><p><b>features: </b></p><ul><li>alarm: 125db and led flash<br></li><li>sensitivity: roller ajustment<br></li><li>power supply: 3 * lr44 batteries</li><li>dim.: 2.8*2.8*0.35 inches(72*72*9mm)</li></ul><p><b>package: </b></p><ul><li>3* window alarm</li><li>9* lr44 batteries </li><li>6* sticker </li><li>1 * user manual</li></ul>