9-LED 5-Mode Multi-colored Light Bike Bicycle Warning Tail Lamp - Black + Red (2 x AAA)
5 Modes: Press once time: All LEDs are steady on; Press twice: All LEDs flicker slow; Press three times: All LEDs flicker fast; Press four times: the middle LED is steady on and the other 8 LEDs flicker alternately; Press five times: turn off all the lights.