Feature: 1. Stable signal, intelligently compatible with 99% of devices,long transmission distance (up to 12m). 2. USB / TF card read directly,which can copy your favorite music into U disk / TF card to play. 3. Audio input: 3.5m stereo sound input, RCA stereo sound input, TF card, ∪ disk, USB audio input (can connect computer / mobile phone / OTG / tablet OTG). 4. The power amplifier can connect mobile phone, computer, tablet, notebook, MP3, TV and projector with AV audio (Lotus socket) or 3.5mm 5. headphone output hole. Various mainstream BT devices on the market can be linked to achieve wireless transmission. Specification: Features:. Stable signal, intelligently compatible with 99% of devices,long transmission distance (up to 12m). USB / TF card read directly,which can copy your favorite music into U disk / TF card to play. Audio input: 3.5m stereo sound input, RCA stereo sound input, TF card, ∪ disk, USB audio input (can connect computer / mobile phone / OTG / tablet OTG). The power amplifier can connect mobile phone, computer, tablet, notebook, MP3, TV and projector with AV audio (Lotus socket) or 3.5mm headphone output hole. Various mainstream BT devices on the market can be linked to achieve wireless transmission. HiFi clear and clarity sound,suits very well for home and desktop use. Specification BT: 5.0 Version, 12M distance Audio Inputs: 3.5mm AUX, BT and USB. Audio Outputs: Banana Speaker Jacks Output Power: 50W*2 (24V/4Ω load) Speaker Impedance: 4Ω-16Ω Frequency Response: 20Hz-20KHz(±1dB) SNR: ≥98dB Power Supply: DC9V-24V (with reverse polarity conservation) Package Size:15cm x 15cm x5cm Package Weight:282g Noted:This product needs to be used with power adapter, please buy it yourself, the product does not contain The 12V batteries of conventional cars and motorcycles can be directly refitted for power supply. The 24 V batteries such as trucks are not recommended because the voltage will exceed 24 V after the car starts up. Long term use is not conducive to the chip or even burned out. Package List: 1× Amplifier 1× Mannul Package List: 1× Amplifier 1× Mannul