brand new and high quality. Features: This external sound card requires no driver installation, plug and for play. It is equipped with DSP parameter adjustment knob to set more effects. It has a built-in 48V fantasy power supply, which can be used with condenser microphones. It supports USB2.0 high-speed connection. Plug in the power and connect the speakers, you can sing even if you disconnect from the computer. It has an Innovative unique mic preamp with individual gain control. Attenuator function button equipped for music fade out automatically when mic signal present. for Mac OS (Intel-Mac) and for Windows XP, Vista (32-bit/64-bit), for Windows 7 (32-bit/64-bit) & for Windows 8 (32-bit/64-bit) External Sound Card only, other accessories demo in the picture is not included. Specifications: Material: Metal Size: app. 140x110x25mm / 5.51x4.33x0.98inch Color: As pictures shown Quantity: 1Pc for Mac OS (Intel-Mac) and for Windows XP, Vista (32-bit/64-bit), for Windows 7 (32-bit/64-bit) & for Windows 8 (32-bit/64-bit) Mic Input Frequency Response : 22Hz to 22kHz (+/-0.2dB) Dynamic Range :95dB, A-weighted Signal-to-Noise Ratio : -95dB, A-weighted THD+N :