The concept is pretty simple, it allows you to spin your torch on your finger and keep it separate from a firearm giving your torch more flexibility.
Now rather than try and explain it in great detail their latest YouTube video (added today) explains it:
SwitchBack Backup : The SwitchBack turns your SureFire Backup Flashlight into a flexible tactical tool. $16.99
Product Description The SwitchBack turns your SureFire Backup Flashlight into a flexible tactical tool.
After taking a look at all the options available for flashlights and weapon-lights we realized that there was a big disconnect: Weapon-lights are great for shooting, but they create a lot of liability when searching. Flashlights are better for searching, but they require awkward grips to align the flashlight and firearm. SwitchBack allows the user to rapidly deploy the flashlight for searching or single-hand shooting techniques, but then reorient the flashlight for use with a two-handed grip just like a weapon-light. We also made sure users could perform reloads and clear malfunctions without having to stow or hang the light. Overall, the SwitchBack allows military, law enforcement and responsible citizens to deploy their flashlights faster, search more safely, and shoot better, without having to own a drawer full of illumination tools.
The SwitchBack fits between the flashlight’s body and the tail cap, making it secure regardless of impact, moisture or heat/cold changes.
The SwitchBack is black and includes an optional o-ring, which may reduce rotation on some models of flashlights. Flashlight not included.
Designed in collaboration with Chris Costa, Costa Ludus.
SwitchBack Backup is compatible with:
SureFire EB1 and EB2 Backup Lights with non-shroud tailcaps, but
NOT the E1B (100 lumen version)
Designed and manufactured in the USA. (Thyrm)