Used vacuum tube MM cartridge phono equalizer amplifier. In addition to being used as a phono preamplifier for MM cartridges on a turntable, it also has Bluetooth, so you can wirelessly connect your smartphone, tablet, or computer to play audio through your amplifier and speakers, which is very convenient. This product has been tested and confirmed to be working. There are no problems with sound output via MM phono when connected to a turntable, or with wireless sound output via Bluetooth. Items included: BOX X3 phono preamplifier unit 5725W vacuum tubes x 2 Bluetooth antenna Power adapter Manual Original box The following is quoted from the sales website: Ultra-low noise performance. Uses 5725W vacuum tubes. Delivers excellent clean and warm sound, providing music exactly as read from the turntable needle. The built-in low-noise phono preamplifier circuit is highly accurate and precisely complies with the RIAA standard. If you are interested in this product, we assume you have some knowledge of used goods, so please refer to the photos and understand that returns are not accepted before considering your purchase. Ships from Tochigi Prefecture No smoking There are pets in the household, so please refrain from purchasing if you are sensitive to this. High-quality MM phono preamplifier using vacuum tubes. - Brand: Fosi Audio - Model Name: BOX X3 TUBE MM PHONO PREAMP - Input Type: MM Input - Output Type: RCA Output - Power: DC 12V - Bluetooth Function: Yes Thank you for viewing.