Lastly the purpose built bike light may have a larger battery or features like USB power that can help charge your cell phone in a pinch. They are extremely light weight I got them so we could ?match? and was worried about weight since my chacos are quite heavy and was pleasantly surprised opening the box. Smells excellent! The connectors are just plastic, and are slightly undersized so that you have to really force them onto the metal tube supports. These are geniune Uggs. They have been great for phone calls and listening to music. The ear pads are soft but tough. Will be easy to clean if it gets dirty. Same size was ordered. The back is stiff, the sides are rubber.