This item will ship directly from the manufacturerFeatures: Microphone out to relay student microphones to computer input for digital recording or Computer Aided Instruction voice input Digital volume control Call Button for student to communicate with teacher from workstation Use any headset with a microphone for communication with the Teacher Aux In to allow music from any mp3 player at the single station or throughout the lab Digital AD/DA converters – 16-bit/48kHz Connectivity: Inputs - Instrument In (RCA), Aux In 1 (1/8” Stereo), Aux In 2 (RCA), Headset Mic Input 1 & 2 (1/8” TRRS, compatible with single and dual 1/8” plugs) Mic Input (1/8” Mono), RJ45 Ethernet input for power and audio connection to Teacher Unit Outputs - Headphone Out 1 & 2 (1/8” TRRS/Stereo), Mic Out (1/8” Mono) Student Interface Dimensions - 4.9” W x 1.2” H x 4.5” D Model# SCI5