The DWT-P01/E4250 digital plug-on transmitter operates within a 72 MHz range, from 470 to 542 MHz. Audio input is selectable from either mic or line level. The DWT-P01/E provides a choice of 1, 10 or 50 mW RF output. The transmitter operates for approximately 5 hours using two AA size alkaline batteries at 10 mW output power. The DWT-P01/E supports use of alkaline, lithium, or nickel-metal hydride batteries. Transmitter functions; including input attenuator, RF frequency selection, RF power output, Audio LCF frequency and a power sleep mode (in the transmitter) can be remotely controlled from the digital wireless receiver. The DWT-P01/E also includes 48V phantom powering.