Enhance your vehicle's Directed Electronics alarm system with the addition of this audio glass break sensor that features a microphone and microprocessor to detect and analyze intrusions, even if the glass is broken quietly.InstallationProfessional installation is strongly recommended for this product.Additional parts and labor are usually required - please contact your local Best Buy store for exact pricing. Follow these steps for installation: Purchase your product — You will receive an e-mail confirming your purchase Find your local Best Buy store Call to schedule an appointment Note: Please be sure to print and bring your confirmation e-mail with you to the store at the time of your installation