1The stereo system has both mono and stereo, you can hear the most accurate monitor sound. 2Professional receivers and transmitter for wireless stage monitoring, studio monitoring, stage sound system, with inear headphones to make your performance more smooth. 3Wireless systems are more complex, but more flexible. 4Support up to 6 selectable frequencies to be used at the same time without mutual interference. 5Perfect for multi-room venues, weddings, mobile DJ's and floor monitor placement.Wireless in ear monitors allow for uncluttered stage sets and a reliably consistent sound wherever you move.This in ear monitor system has both mono and stereo, ideal for using by singers and musicians. Features: 1. The stereo system has both mono and stereo, you can hear the most accurate monitor sound. 2. Professional receivers and transmitter for wireless stage monitoring, studio monitoring, stage sound system,with in-ear headphones to make your performance more smooth. 3. Wireless systems are more complex, but more flexible. 4. Support up to 6 selectable frequencies to be used at the same time without mutual interference. 5. The signal is stable, almost no delay. 6. Perfect for multi-room venues, weddings, mobile DJ's and floor monitor placement. Specification: Condition: 100% Brand New Material: ABS Color: Black Model: For ANLEON S2 wireless monitoring system (561-568Mhz) Receiver Battery: 2*AA (NOT INCLUDED) Product Name: For ANLEON S2 Wireless Monitoring System (863-865Mhz) (without battery ) Frequency Response: 20Hz~18KHz Antenna: 1/4 wavelength Transmitter Power Supply: DC9V / 300mA Transmitter RF Output Power: 10 mW Receiver Standby Time: greater than 12 hours (using 1.5V 2*AA battery) Use Distance: Indoor 50 meters, Outdoor more than 100 meters Optional Carrier Frequency Range: 561-568Mhz (Common to America) Weight: Approx. 888g / 31.3oz Optional Plug Type: UK Plug, US Plug, AU Plug, EU Plug Voltage: 100-240V Transmitter Design: For Front panel of S2 transmitter Headphone output port can be plugged into 3.5mm headphone plug VOLUME knob adjusts the sound output of the transmitter headphone The Stereo/MONO button selects the audio connected to the INPUT (L) input and the INPUT (R) input to mix instereo or mono. In stereo Stereo mode, audio connected to INPUT(L) is sent to the left earphone, and audioconnected to INPUT(R) is sent to the right earphone. In mono MONO mode, audio connected to INPUT (L) and (R) issent to the headphones on both sides. For S2 transmitter rear panel Power button turns the power on and off INPUT(L) receives signals through the XLR line, and in stereo mode, the signal is sent to the left channel INPUT(R) receives signals through the XLR line, and in stereo mode, the signal is sent to the right channel