Unfortunately, we cannot order spare parts for this item from our supplier :(

There is a black button right in the middle of the light case. Press multiple times to switch the LEDs blinking patter until is switches off.

Yes, it's a child's helmet. The head size is 45-51 cm (adjustable). It is size XS-S. Recommended for children from 12 months. The head size is usually measured 2 cm above the eyebrows.