Audio-Technica System 10 ATW-1101/L Wireless Lavalier System Digital 24-bit/48 kHz wireless operation for ultimate sound quality and dependable performance 2.4 GHz range - completely free from TV interference Automatic frequency selection for seamless, interference-free operation Extremely easy operation with instantaneous channel selection, sync, and set-up Includes ATW-R1100 receiver and ATW-T1001 UniPak transmitter with MT830cW omnidirectional lavalier microphone.