The Vonys STM-2270 is a 2 channel mixer with USB input, an SD card reader and Bluetooth for starting DJs. You play MP3s from your smartphone or tablet thanks to Bluetooth connectivity. Do you prefer to play music from a USB stick or SD card? Thanks to the USB and SD card inputs this is possible. To mix music just like a DJ, connect a CD or turntable to the mixer. With the players you adjust the speed so that you synchronize 2 plates with each other. This way you prepare a smooth mix transition. To make a call, connect a microphone to the 6.3 millimeter input.