5 small LED lights inside the rear light. 7 Mode bicycle rear light. High intensity LED bicycle rear light. IC controlled . 7 Modes: Constant on & 6 different flashing modes. Single Button Operation. 5 super bright red LEDs, wide beam . Long lasting : Up to 150 hours for 2 x AAA batteries (not included) . Size: 4 x 7 x 4 cm.