Using the RTS TR - 240 wireless intercom beltpack is easy. First, make sure the BP - 240 7.5 - volt Li - ion battery pack is fully charged. Connect your device to the beltpack using the A4F connector. Turn on the beltpack and pair it with your communication system. When you're done using it, turn it off to save battery. Keep the beltpack in a dry and clean place. Avoid exposing it to extreme temperatures or moisture. If the battery performance decreases over time, consider replacing the BP - 240 battery pack.