TESTED EARTEC UL2S UltraLITE-HD FULL DUPLEX INTERCOM SYSTEM — SET 11. • Eartec UL2S UltraLITE-HD system. • 1 Eartec UltraLITE-HD Single-Ear MAIN/MASTER Headset. • 1 Eartec UltraLITE-HD Single-Ear REMOTE Headset.