- hmm... have had my three wireless Sigmas running for 13 months so far and no batteries needed...
- AFA the OP's question: this is a good one, as i have one BC500 that does turn on automatically, while the rest of my other five (BC500s and BC800s) do not...
- personally, i prefer that the computer does NOT turn on automatically when a sensor is in range or a revolution count may be triggered...