Feature: 1. [Ease of Use] The monitoring system features simple controls, selectable sound frequencies to optimize your sound, allows volume to be set at safe levels, blocks unwanted stage noise. 2. [Stable Performance] Ear monitor system features UHF wide sound signal transmission in the 600 to 690 MHz frequency range, which works flawlessly in both studio and stage environments without distortion. 3. [Wireless] Monitor and receiver system provides desktop stage monitoring with wireless range up to 200 meters, kit includes sound system transmitter, digital bodypack receiver and earbuds. 4. [Professional] Four channel ear monitoring is designed for professional sound effects, durable and stable monitoring system, real time monitoring of background music, singers singing without pressure. 5. [Multi Application] Professional stage monitoring system, purer sound and enhanced performance, providing consistent sound performance, suitable for recording monitoring, music monitoring, etc. Specification: Item Type: Wireless Monitor System Material: ABS Model: EM D04 Scope of Application: Suitable for Professional Places Such As Stage Performances Bodypack Receiver Built in Battery: 8 x AA Dry Battery (Not Included) Host Transmitter: Frequency Range: 600-690MHZ Transmission Method: FM, Mono Number of Channels: 16 RF Output Power: 50mW Frequency Response: 60Hz-17KHz±3dB Bodypack Receiver: Frequency Range: 600-690MHZ Number of Channels: 16 Transmission Method: FM, Mono Receiving Method: Diversity Acceptance Sensitivity: -100dBm (Sinad≥30dB) Wireless Range: Approx. 200m/656.1ft. Package List: 1 x Monitor Host4 x Bodypack Receiver1 x Power Adapter4 x 6.5mm Wire4 x Earbuds2 x Antenna1 x Manual