These are one of the the best value lights out there and if you find them cheaper please let me know for a price match.
Use them for deep dropping, droning or general use around the camp.
Twist the light in half and Insert the batteries for operation and remove the battery after use.
There is one hole on either side to connect to a split ring, loop or tie directly
These come with 2x CR 425 lithium battery, spares can easily be bought online through EBAY etc
Blue, green, red and mixed pulse