You don`t have to leave the house unsecured! This backpack includes two built-in high decibel sirens, and a high intensity strobe light that can be seen up to 400 yards with a concealed activation switch for your personal safety. Made from durable nylon materials, this 46cm high, 30cm wide, 14cm deep backpack has a mesh lined fully padded back and 8.3cm wide adjustable shoulder straps. The inside boasts a padded laptop sleeve, and plenty of room for everything else, and secures with two top zippers that make access easy! The front includes three quick access pockets with an organiser for pens, cell phones, keys or loose change, and two adjustable buckles on each side help keep everything in place. Alarm activation/maintenance instructions, and two 9-volt batteries are included. NOTE: The sirens produce loud sounds (approximately 120 decibels at 30cm from the unit) that may damage hearing if used incorrectly.