This unit can be a life-saver in an emergency situation by allowing the user to place a call when a cell-phone battery dies. Simply plug the adapter to the phone and wind the handle. For every minute of winding the phone will receive enough energy for 2-3 minutes of talk time. It will charge any phone that has the required adapter. It comes with a Nokia adapter cord which can be plugged into any cell-phone adapter. Purchase the adapter package which includes 16 different adapters to supplement this product (recommended).