Professional Audio Mixer With Dual Wireless Microphones, Suitable For Dj Karaoke Product Details ?Product features? 4 channel mixer audio, with 2 handheld UHF wireless microphones, open the mixer panel (MIC ON), the microphone will automatically connect. The receiving distance is about 180 feet.Each Mic Has 15 Groups of Frequency Selection,UHF Wireless Microphone Frequency Is CHA 576.1-590.1Mhz, CHB 560.1-574.1Mhz ?Usb Audio Interface?Channel Interface?The Mixer Audio Usb Interface Can Be Use for PC/Phone Recording or Player Music,Need a USB To Phone Adapter To Connect To The Phone. 1-2 channel has gain control, Treble/Mid/Bass/Control, FX Reverb control independent volume control. 3-4 Channel are RCA stereo inputs, this channel only has volume control, For input and connection computer music, vcd, dvd, cd player, TV audio signal.?Incompatible: speakers whose interface is optical or coaxial? ?Wireless microphone Bluetooth? The Wireless microphone Volume, Echo, Equalization, Gain Can be Control From No.2 Channel. Bluetooth 3.0 Cordless Music Transfer, Transmission Range up to 35 Ft, BT name: BT-NSMIX. USB LEVEL:MP3/BT Volume Knob (Press TO MAIN) [Use] MX-R42 soundboard echo and tone control are adjustable, bringing more karaoke fun. It allows you to mix microphone signals with music without using an additional mixer, and can be used for karaoke, DJ music, family gatherings, lectures, etc. [After-sales service] If you have any questions, please feel free to contact us. We provide 24 hours a day service for any questions and concerns. ?You will get?1*MX-R42 Mixer, 2*Handheld Microphone, 1*Power cable, 1*5V2A Power Plug,1*USB to USB cable, 2*Mic Protection Ring, 1*Manual. Note: Each microphone requires 2*AA batteries (not included) A reminder that the MP3, Bluetooth and USB functions are only available as one of the three options and cannot be used simultaneously. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.