Eagle Tree Alerter LOUD multitone buzzer with programmable volume provides audible indication of errors and other events Three SUPER BRIGHT LEDs with programmable brightness, and diffused viewport Unique, programmable Inactivity Alarm serves as a lost model alarm, and alerts you if you forget to disconnect your flight pack For multirotors, LED brightness and buzzer volume can be programmed to be at highest levels only when armed LEDs show Vector status, number of GPS satellites in view, and more