The Cateye Wearable X Rear Light can be used in a variety of different places such as directly onto your bike, on your rucksack/luggage or attached to your clothing making it a very versatile light for multiple uses. It s extremely lightweight only weighing 20 grams that you won t even notice. It offers 180-degree visibility, a USB rechargeable battery and a rubber band & clasp for mountain biking. With a recharge time of only 2 hours this little light is packed with great features for such a low price.6 modes including; High / Low / Flashing / Rapid / Pulse / VibrationRuntime; High 1hr / Low 10hrs / Flashing 30hrs / Rapid 10hrs / Pulse 10hrs /Vibration 10hrs