The Sony DWM01/F3130 Digital Wireless Microphone is a digital transmitter for use with compatible Sony digital wireless microphone receivers. The DWM01/F3130 handheld transmitter features a compandor-free system for stable, noise-free operation. Its dynamic capsule features a supercardioid polar pattern for effectively minimizing off-axis noise and feedback. The transmitter also features adjustable output power, RF frequency selection, input attenuator and more.