TaylorSense is a smart battery box equipped with sensing technology that monitors your Taylor guitars humidity, temperature, battery life, and impact incidents. The battery box replaces an existing battery box on Taylor guitars featuring any of the following onboard pickups with a 9V battery: Expression System 1 or 2, ES-T, or ES-N. In addition to tracking the guitars condition, TaylorSense uses low-energy Bluetooth to send your guitars data to the free TaylorSense Mobile App available for both iOS and Android devices which sends push notification alerts when the guitar needs care. The timely alerts include links to easy-to-follow videos created by Taylors experts that show you how to solve problems when they arise.The TaylorSense Mobile App is compatible with most iOS and Android mobile devices and operating system versions. • MFSKU 1318 • UPC 887766061960