ANLEON S2 UHF Stereo Wireless Monitor System 4 Frequencies 670-680MHZ Professional Digital Stage In-Ear Monitor System Device Features: • 6 selectable channels • Powered by 2pcs AA batteries, low power consumption design for long playtime up to 12 hours • Multiple sets of receivers can be operated with a single transmitter within the operating range • Dynamic expansion circuitry for high S/N ratio • Complex anti-interference circuit for using 6 sets at the same time without mutual interference • Receiver LCD displays frequency, channel and battery level Long operating range up to 100m System: ANLEON S2 is an IEM system designed for stage performance and broadcasting. High S/N ratio and dynamic range ensures optimal audio quality. The dual XLR inputs allow 2-channel, mono or stereo operation with a convenient mix function which allows you to run two sources into the S2. Intended for drummers/keyboardist/guitar player/vocalist and other performers, the unit features a high-power headphone output that helps to ensure that as the band gets louder, you'll still be able to hear your performance. S2T UHF Stereo Transmitter: Volume Control: Adjustment of the volume for both output channels. Stereo/Mono switch: Stereo mode (the device outputs the signal fed into the left input to the left headphone and the right signal to the right headphone). Mono mode (Channel L and channel R are mixed and output to both headphones.) Power Switch: Switches the unit on and off. XLR INPUTS (L) and (R): Dual XLR balanced jacks connect to the input signal source. 9V DC socket:  Please use the included 9V 300mA adapter S2R UHF Stereo Receiver: 1, LCD screen: Displays frequency, channel and battery level. 2, Antenna: Receives RF signal from the transmitter. 3, Power indicator: Green indicates functioning battery. 4, Earphone socket 5, Power and volume knob 6, Frequency adjustment button 7, Battery compartment                      Specification: Channel:6 Headphone output: 3.5mm jack socket Transmitter Power Supply: DC9V/300mA Receiver Operating Time: up to 12 hours, 2x 1.5V AA (Not Included) Operating Range: 80m(environment dependent) RF Output Power: <10mW Signal-to-noise ratio(1 mv, peak deviation) typ. 70 db(A) Frequency Response: 20Hz~18Hz S2 Wireless Monitor System for: Recording studio monitoring, on stage monitoring Drummers Keyboardist Guitar player Vocalist Bass player Cautions: 1.Using this system at excessive volumes can cause permanent hearing damage. Use as low volume as possiable. 2.When not using this system for a long time, please take out the batteries. Package Included:                      2 x S2R Receiver                                          1x S2T Transmitter                     2x Earphone 1x DC 9V/300ma Power Adapter