Supernova is known for very high quality, rugged products. The M99 is a wired tail light solution that can be adapted to motor controllers with 12V outputs or to the eBike battery via a 12V step down voltage converter. 
 
3 brightness levels including a signal wire for brake light activation if equipped. Polished black annodized alumuminum frame. 
 
22 x 61.5 x 11.6mm @ 25g