These lights are easy to attach to a bike. The band is stretchy and hooks onto a nub, like a belt. It has holes to fit a variety of tube sizes. The front light has an adjustable angle. It can also be attached to the included headband.
The light is reasonably bright and easy to use. It has several flashing modes as well if you just want to use it for visibility more than a light source. Both lights recharge with microusb cables (2 short ones included).
It’s a nice set to increase visibility of your bike.
It’s currently available for $14.95 on Amazon: http://www.amazon.com/dp/B01AG1LKU6
The manufacturer’s website is here: http://thebrightoutdoors.com/bike/
Full Disclosure: I received this product for free or at a discount in exchange for my honest review.