Highly RECOMMEND Tony Little Aurawave Butterfly Accessories for T.E.N.S. Unit. These Are Great and Love Size. Can Use Almost Anywhere on Your Bodies. Like the Idea of Setting Time and Not Having to Remove as Soon as Timer is Up, Can Wait Until Later and Turn on Again for Another Treatment. Be Sure to Give Time in Between. Last Longer Than Expected, Problem Sticking Spray a Little Water on Butterfly, Make Sure Electrodes Are Off, and Lotions Have Been Cleaned on Body!