This light can be synced as an accessory to all our VS wireless bite alarm sets.  The central LED color can be matched to those on your alarm and receiver so that you know which rod is going off.  At the same time, the surrounding LED's will light up in white providing instant  light at night.  It can also be used as a standalone bivvy light.  It's easy to attach to your bivvy using the magnets and backing plate included and has 4 brightness settings.  Its also USB rechargeable.... so no need to worry about batteries!