Note:The product is a preamp(Pre amplifier), not audio amplifier. The electronic tube bile preamplifier, the audio signal input end can be connected to the PC, phone. CD, mp3,Lossless music player and other audio sources, the output can be connected to various digital power amplifiers, active multimedia speakers and other audio equipment. Features: MS-10D (Home,vehicle application) Multifunctional Electronic Tube Amplifier Lossless Music Player,core chip audio decode chip.Can play mainstream APE,FLAC lossless music format. 1 support external audio input, support a variety of audio input (mobile phones, mp3, cd, computers, etc. 2 support for FM function, radio frequency 87.5-108Mhz, there may be some poor signal, the signal is not the difference between you and I can decide 3 Bluetooth support Bluetooth version 4.2, support for a variety of mobile phone Bluetooth audio transmission 4 Support USB reader function, support lossless MP3 APE WAV FLAC and other audio formats(More format informatiion below) Specification: Side:9.5*10.5*3.9cm Color: Silver/Black Material: Aluminum Audio input: RCA input Power supply:DC12V-15V Current recommended:1A-1.5A Tube:2*6J3(Support 6j1/6j2/6j3/6j4/6j5/6a2/6k4/6k5/6ak5/6au6/6ba6/6bd6/ef93/6k7/ce5654 etc.) U-DICK Max support:32GB U-DICK Play Format: Supported formats:MP3/ WMA /APE / FLAC /WAV Unsupported formats: The following format cannot be played normally 1.code is configured as "Extra Higf" APE. 2.WAV. with a bit rate exceeding 4608kpbs 3.DTS encoded APE/WAV. 4.AAC/OGG/MPC and other formats. The product is rigorously tested to ensure that no problem is issued, Product itself does not own noise. So if come with noise,pla ensure the problem as follow not happen. 1. If the tube is not inserted, please double-check the tube. Please be sure to insert the tube in the event of a power failure (this is the most frequent). 2. The previous band with the signal amplification, if the sound source itself with noise, then the sound source will bring their own noise together, so please use a good sound source test. 3. The signal line is not good or the noise caused by poor power supply can replace the signal line or power test. Package List: 1 x Preamp And Remote 1 x Power Adapter(Optional) 1 x 2RCA Cables(Optional) Note:(THis Remote is not included batteries,you need prepare 2 batteries yourselves)