PLL –16 CH Selectable frequency wireless microphone system. 32 Khz Digital Tone Pilot. New durable Painting Finishing. Universal USB Power Adapter. 518 – 550 Mhz frequency range 30 meter/ 100 feet range 50 Hz -15 KHz frequency response -105 dB signal/ noise ratio. Cardioid dynamic capsule. Condenser headset with cardioid capsule. Up to 4 frequency usable in the same location. ABS carrying and storage case.