Audio Technica System 10 ATW-1701 Portable Camera Mount Wireless System with FREE AT831cw professional uni-directional lapel microphone Digital 24-bit/48 kHz wireless operation for ultimate sound quality and dependable performance Operates in the 2.4 GHz range - completely free from TV interference Extremely easy operation with instantaneous channel selection, sync and setup and three levels of diversity assurance: frequency, time & space for seamless interference free operation Ultra compact receiver size with multiple mounting options; selectable balanced and unbalanced output jacks with level control for use with most cameras and recording devices.Internal rechargeable 12-hr battery, separate headphone port and volume control for local audio monitoring - Includes professional omnidirectional lapel microphone Bundle includes the AT831cw professional uni-directional lapel microphone