The wires are 20cm (approx. 8in) in length. A Coupler may be used to extend the wires without having to solder.
To light a micro LED without a Morsel or Ditto, the LED turns on about 3v with a current of up to 20mA. So for example, 2 AA batteries in series (which is 3 volts) with a resistor, or 1 CR2032 watch battery (which is 3v) with a resistor will work.