Using the LD Systems ANNY BP Bodypack Transmitter is easy. First, insert the 2 AA batteries into the unit. Connect your microphone or instrument to the mini - XLR input. To pair it with the ANNY receiver, use the infrared synchronization feature. You can adjust the audio levels using the 3 - stage input level switch. When you need a break, use the standby mode instead of fully powering off. As for maintenance, keep the unit clean and dry. Replace the batteries when the red LED indicates low battery. Avoid exposing it to extreme temperatures or moisture. That's all you need to know to get the most out of your ANNY BP Bodypack Transmitter.