Bicycle Tail Light Super bright, LEDMO Rechargeable Bike Waterproof Light, Red LED Rear Ultra Bright Night Light With USB charger for Safety Cycling Warning Light 6 modes : Low, Mid, High, 50% Flashing,100% Flashing, and Strobe. super easy to use and to change between the 6 modes. Super Bright: If you like to ride or other at night or in partial light , this will let all the motor vehicles know that you are around ,very helpful and makes for a safer ride. Easy attachment:The light comes with a rubber band type attachment that takes about 30 seconds to install. it can be positioned horizontally or vertically. USB Charger: it can be recharged with a standard micro usb,never have to worry about buying new batteries.1 hr to charge it,6 hours of run time set on low, the different settings on this vary with how much power they consume. Very flexible: you can put it on your bike or helmet any which way you want to, It can be easily attached to pretty much anything.