Building tools into your EDC is the best way to ensure you have options for when things go sideways.
The SPARROWS S.E.R.E wallet incorporates several different signal options and a door bypass tool.
For rescue and team communication the wallet has a mirror finish for traditional solar signals, glow dot for night time and a reflective spot for quick flash.
Also built in is a door lock Jim Style bypass tool for opening locked but live latches.
The finish is a black PVD over stainless steel and when the band is in place both the reflective and glow dots are murdered out ensuring zero flash until intended.