The specialized flux elite front bike light offers exceptional visibility when you39re riding at night to ensure you can see where you39re riding and everyone else can see you this compact lightweight light is like riding with a small car headlight on your bicycle as it can output up to 400 lumens the bike has a powerful down firing cree led with a patented reflector for a wide bright automotive style beam this front bike light runs on internal rechargeable 1400mahr liion batter