I use dog chain leads. To adjust I use the clip for the collar to clip through the chain links.. Cost $2 each at reject/ dollar shops... most do sell with the mislead of full power..but most come up with the panel name by led wattage ran at 100%.. Example would be 100 3w LEDs, panel would be called a 300w.. Mars 400 is 80 5w LEDs. 80x5=400... Panels me and Jandre have were one of the few that sold as actual wattage. Not that it did us any good, lol. Have to lol, what else can you do, lol....