BlackBoard - U

grabcad

This compact device, measuring just 73x57x28mm without accessories, is designed for ergonomic comfort and easy handling. The LEDs are arranged in a U-shape for effective light transmission, while all tricolor LEDs ensure complete illumination in four colors: blue, red, green, and amber. In the ON/OFF mode, the device flashes intense blue before switching to a soft blue-green tone. Bluetooth connectivity is signaled by pulsing blue LEDs, while accepted transactions display green and denied ones flash red. Battery status indicators include progressive green flashing when USB connected and amber flashing when disconnected (25% or less). A red continuous blink signals very low battery levels. Interactions related to the battery occur during inactivity periods. The magnetic stripe reader, an optional component, is incorporated as a separate element, while wall-mounting holes are included for convenience without adding extra cost.