Just got a USB-Two. Super Slick system. Put your phone on your stem/bars and not worry about your battery going dead part way through a ride due to running Strava or Ride w/GPS. Also, being able to use your light at the same time. Winner! Winter and darkness is setting in. Grab one of these, you won't be disappointed. Also, just use it around the house or camping! Grab you Lupine Battery and go. You'll be all set!