TUBE T4 6J1 Tube Preamplifier<br> 100W+100W Bluetooth Amplifier<br> Input and output adopt gold-plated RCA lotus seat<br> Nice touch,All aluminum alloy shell,heavy gold PCB<br> Can connected to MP3, computer CD, DVD, mobile phone, etc<br> The Sound quanlity really good,Let you enjoy sweet and warm sound<br> Note:Pls install the Bluetooth Antenna before to use,thanks!<br>