HD-HYNUDAL Online Singing Machine Karaoke Set with 1 Condenser Microphone for MID,TV,PC,Laptop,iPad,DVD YAMAHA chipset, perfect sound quality, pure tone Supported series phones, Iphone,IPod, MID, DVD, HD player, Blue-ray DVD, PC and other audio input Dual microphone interface, support the chorus, can adjust the microphone volume individually Frequency response?40Hz---16KHz Dimensions: 6.89 * 4.33* 1.57 (inches) Working hours:Unlimitedturn off the power when rest