Using the Eartec UL3S UltraLITE system is a breeze. First, make sure the lithium polymer batteries in the headsets are fully charged. You can charge them using the provided charger for about 3 hours. Once charged, turn on the 'Master' headset and then the 'Remote' units. You're all set to start having hands - free conversations with up to 3 other people. The mic boom can be adjusted to fit either your left or right ear. Remember to keep the system within the 400m open - space range for the best signal. When it comes to storage, keep the headsets in a place where the temperature is between - 10 C and 60 C. For normal use, try to keep the temperature between 0 C and 10 C. If you're not using the system for a long time, it's a good idea to store the headsets with a partially charged battery to maintain battery life. And since there's no need for FCC licensing, you don't have to worry about any extra setup steps.