Using the Sennheiser SK 2000XP wireless bodypack transmitter is quite simple. First, make sure you've checked your country's wireless frequency laws as this unit might not be legal for use in some places, like the U.S. Then, ensure the software revision 1.7.7 is installed. When it comes to using it, just turn it on and start transmitting your audio. Be aware that the antenna is exposed, so handle it carefully to avoid any damage. For the battery, it has an ew 100 g3 battery door. Replace the battery when it runs out. As for maintenance, keep it clean and dry. If you notice any issues, check the software for updates or contact customer support.