Each pack is containing one pair of Halos, one white and one red. Features a solid and strobe light modes. For the absolute best visibility use the Halos above the elbow, white facing forward and red backwards. The reason for that is that you will be a lot more visible through other cars. We think that safety is NOT an option!
Batteries are included. Type: 4 x CR2032 (3V) Remove the protective paper between the batteries before use. NB. Do not bend the plastic strap, it is fragile. Use the velcro only.