I use iNova Microlights. They are foolproof, failproof and pretty darn shockproof. They all come with clips, easily attatched to any kite or line, come in assorted colors. They can be seen for MILES, and can be set to low, high, or strobe. I use them on all my kites, slk's, dualies and rev. Depending where you get them, anywherer from 5 to 8 bucks each, replacable batteries are cheap too. The only brick and mortar I have found them in is Academy, for 8 bucks, and a 6 pk of replacement " button " batteries is 2 bucks. Highly recommended.http://www.inovalight.com/microlight/ ( and a set of batteries will last 24 hrs or more, they take two )