ISF1013 Features: * Foam back provides extra padding for greater comfort and maximum back support * Shoulder strap reflectors provide night time visibility for additional safety * Large front compartment designed to compartmentalize items * Adjustable chest strap designed to prevent the backpack from easily being taken from the user * S-Shaped shoulder straps are ergonomically designed for comfort * 420 D Dobby PU Fabric * 2.3 lbs (with batteries) * Designed for ages 8 and up * The alarm system can run continuously for up to two hours before the batteries must be replaced * When the batteries are too low to effectively operate the alarm system, a red LED light will flash for 72 hours to indicated replacement of batteries * The strobe light can be seen up to 400 yards away * The siren signal can be heard for over a 1000 yard radius on both sides of the user Specifications: * iSafe Backpacks & Bags operate with two 9 volt alkaline batteries Dimensions: * Overall dimensions: 17"" H x 11.5"" W x 9"" D