XTAR SD1 Mini dive beacon review by @Try T.V, “Xtar SD1 beacon with 4 colors and 8 modes meets diverse lighting needs. Whether you need to signal with flashing lights, or preserve the night vision, the SD1 has the right mode for you. Switching between modes is straightforward. Simply twist the light body to select desired colour and lighting mode. And it equipped with lanyard, snap hook for quick and secure attachment. Easily to attached to the speargun so it can easily be seen in the darkest depths of the sea.”