1. 9X8 cm
2. Gold and Silver
3. Charge (BTW charge devices also runs with battery, only difference froma regular battery is its re-chargable). Because, I hate to buy batteries whenever the camera/monitor would be out of power.
4. I don't have a bike anymore but I still got my helmet, so 1 safety product.
5. Nah, I just hang the helmet to the bike.
6. Never.