EL520 front light uses a high/low beam. Cateye have utilised a new ultra bright led providing 1200 candle power. With a run time of up to 240 hours on low setting. Handle bar mount is tool free and will fit std. and oversize bars. LD610 rear light offers improved side visibility with its 5 huge led's. Highly water resistant. Will run for 30 hours in constant mode and 60 hours in flashing. Batteries included.