Bike Light Danger Zone Tail Light + 2 Front Aluminum LED Bike Light + Extra Pack of 4 Batteries Utilizes 1-LED to produce a bright light even at night; each light contains 5 15,000mcd LEDs Light is visible up to  mile for easy visualization of path when riding in the dark Includes 2 Li-ion batteries + Extra Pack of 4 Batteries Made of waterproof ALUMINUM ALLOY ; quick and easy installation