Using the Eartec UL2SD UltraLITE headsets is easy. First, make sure the headset is fully charged. You can wear it on either your left or right ear, just adjust the mic boom to your preferred position. Turn on the headset and start communicating. In high - noise areas, the noise - canceling microphone will help others hear you clearly. When not in use, store the headset in a cool, dry place within the temperature range of -10 C to 60 C. Charge the headset every 6 hours of use. The charging time is about 3 hours. Avoid exposing the headset to extreme temperatures or moisture. Clean the ear cups and microphone regularly with a soft, dry cloth to keep them in good condition.