HD-HYNUDAL&reg; Karaoke Mixer/Converter Online Singing Machine with 2 Wireless Microphones Built-in Wireless microphone receiver function, Work with our wireless microphone Imported top chipset, perfect sound quality, pure tone Supported Apple series mobile phones, IPod, MID, DVD, HD player, Blue-ray DVD, PC and other audio input Stable performance , Working long time sustainablyturn off the power when rest Dimensions: 6.89 * 4.33* 1.57 (in)