Don't throw away that old transistor radio! Re-purpose it into a time machine with strange, nostalgic broadcasts through the original speaker. Complete with a choice of custom time-destinations and fluttering amber light reminiscent of old tube radios. Makes a great gift with a surprise inside and no exterior signs of modification. Skill level: Medium. No computer programming necessary.Time: First one takes about 8 hours, then about 4 hours each once you get the hang of it.Green: Recycled broken radio, re-purposed LED's and batteries from tea lights.Materials cost about $13.85 including batteries.