Freeplay Energy - Energy for Life

The FreeCharge 12V, as its name implies, puts out power at 12 Volts (nominal; regulated to a maximum 14.2 V).

The amount of current it delivers depends on your cranking speed.  Typical performance for a mobile phone is that if you crank at 120 rpm then one minute of winding will give you 2-4 minutes of talk time (or much more standby time), while three minutes of winding will give you 9-11 minutes of talk time.