Customized senior shielding inductor approved by audiophiles in popular forums, improving the most important LC filtration procedure for digital amplifiers The Bluetooth Hi-Fi wireless connection uses top British CSR 4.0 Bluetooth module, ensuring high-quality audio transmission With FM function, you can listen to the music any time and any where Compatible with car, motorcycle, Mp3, computer speaker and other audio applications AUX high fidelity audio frequency inputs and easily connects to an extensive audio-visual product of CD / DVD / PC etc. Real 2RMS x 20W stereo circuit design Built-in circuit for speaker protection and delay, ensuring that there is no impact sounds upon shutdown / up and that your valuable speaker would be well protected ( speaker be included in the circuit 3 seconds after up ) Name: Model Number:-502S Input power: DC 12V Speaker impedance: 4 - 8ohms Frequency response: 20Hz - 20KHz Total harmonic distortion: more than 0.05 percent Sound track: 2 SNR: 85dB Design: Car,Fun,Mini,Multifunctional,Portable Compatible with: MP3 Supports: Bluetooth,FM,Remote Control,SD Card Music Playing Functions: AUX Function,Noise Cancelling,Songs Track,Stereo Connection: Wired,Wireless Interface: 3.5mm Audio,Power Charge Port,SD Card Slot,USB2.0 Audio Source: Bluetooth Enabled Devices,Electronic Products with 3.5mm Plug,Electronic Products with USB port,SD card Material: Aluminum Alloy Color: Red Product size (L x W x H): 15.50 x 10.50 x 4.50 cm / 6.1 x 4.13 x 1.77 inches Package Contents: 2 x Amplifier 2 x Remote Controller 2 x English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.