The S4000 IEM is a UHF stereo In-Ear-Monitoring system. 

S4000 IEM TRANSMITTER FEATURES

• Type: Fully synthesised, microprocessor controlled
• Up to 32 channel capability
• Carrier Frequency: 790-865MHz (32MHz BW)
• Operating Bandwidth: <180kHz (stereo)
• RF Output: 10dBm via detachable dipole antenna with TNC connector
• Stereo Input: Electronically balanced via XLR or unbalanced via Jack
• Input Level: -20dBu to +10dBu adjustable
• Stereo/Mono indicator
• Left and right channel peak indicator
• Power Supply: 12-18V DC (250mA)
• Dimensions: 210x165x30mm
• Weight: 100g