The transmitters feature built-in mics and are paired with the receiver at the factory, making the system easy to use for anyone, and delivering reliable wireless transmission with a clear sound at a distance up to 328 . Built-in rechargeable batteries in the transmitters provide up to 10 hours of operation, while the receiver is powered via the Lightning port. The included storage case features a built-in battery to recharge the transmitters and provides 35 hours of shooting time between charges.