Krown's All-In-One Alerting Solution alerts to an incoming telephone call, doorbell and doubles as an alarm clock. The LookOut™ alerts you in 5 different ways: Built-in LED lights, loud audible alarm, strong bed-shaker, flashing words across the large display, and picture icons that light up when activated. All these functions are integrated into a sleek, well-designed wireless system. The LookOut™ also includes a USB port to charge smart devices. The Krown All-In-One Alerting Solution was designed specifically to meet all ADA requirements in your guest room, dormitory, multifamily housing, and more! This is the permanent or portable solution for all your needs. Backup Power Requires 3 "C" batteries (not included)