There are already several similar products at the market that combine an mp3 player and a headlight, nearly all are made in china, they are mostly good but very expensive. A model is sold for 95€uros here.
On the other hand, there are many headlights, hand torches and mp3 players which does their jobs very well and are very cheap. So I’ve concentrated on this deep :-) issue and designed an mp3-headlight-torch suitable both for bike and manual usage and costs much less the market products by using the parts of very cheaply available mp3 and lighting products.
Step 1: Requirements
Listening to your favourite music while cycling is nice. You don't want the music to be interrupted due to drained batteries.It is also nice to have the product do other duties like ligting in the smallest package coz bike handlebars are already full of other instruments nowadays.