Breakthrough flat panel Surface Sound ™ speaker technology from NXT ® makes clear & rich omni-directional stereo sound possible in a small package. Add sound effects & music to your presentation by connecting your computer or other auxiliary audio system. There is no complicated set-up – just plug in the speaker, connect a microphone & you are ready to start speaking. Accessory Type: Amplifier; Voltage: 240 V; Power Source(s): AC Power; for Use With: Line Input / Computer, CD Player, iPod ®; Output GoSpeak! Pro.