Item Description: 4 Ways Music Input: SD Card + MMC Card + USB +ipod\CD\DVD AUX 2 Extra Function : FM Radio + Wireless Control 4 Fit For :Car\Home\Boat\Motorcycle DC 12V Can play the disk SD /MMC card for music and FM stereo radio， support Mp3 music format.( USB+SD +FM) Select high-power four channel professional power amplifier integrated circuits， minimal distortion， strong power Pre-professional level input operational amplifier IC for circuit design， sound ， transparent，bright. Filtering and anti-large-capacity power circuit DSP sound field pattern of the four Select high-power 4 channel professional power amplifier integrated circuits， minimal distortion， strong powerItem Specification : MP3， iPod， CD /DVD player input jack Low distortion Frequency response : 20Hz-20kHz Haronic distortion: < 0.05% 4W 1KH SNR : 85 dB Jack input: standard stereo jack Reader， U-disk format : MP3 FM Built-in FM function?FM87.5MHZ-108.0MHZ) Hight control :12dB +-10 KHz Bass control : 12dB +-100Hz The signal level : 220 MV 47 K reader， U-disk formet :MP3 FM FM frequenvy: 87.5MHZ ---108.0 MHzItem Feature: Volume: volume adjustable and host switch Bass: bass tuning Treble : Hight adjustment mode: play mode ，selection clickn play U disk's song double click played SD's song three click played Fm stereo radio Play/scan: the play/pause/Fm automatically adjustable. play modes: short pause ，click this button again according to play .short fm mode， click this button for fm automatically adjustable. next: next (in the play) Prev Back (in the Play) Size: 15*16.3*5cm Voltage: DC 12V Output Power: 4* 20 W Dimensions: 15*16.3*5cm Material: lightweight aluminumApplication: Can play the disk SD /MMC card for music and FM stereo radio， support Mp3 music format.( USB+SD +FM) Select high-power four channel professional power amplifier integrated circuits， minimal distortion， strong power Pre-professional level input operational amplifier IC for circuit design， sound ， transparent，bright. Filtering and anti-large-capacity power circuit DSP sound field pattern of the four 4 main channelPacking Content: 1X Stereo Amplifier 1X Controller 1X Use Manual Notice : This Amplifier did not include the power adapter.Note:This manual is universally use for our manufacturer ， so the output power is not confirm to the product on sellPlease feel free to contact us if you have any question， Looking forward to do the business with you!!!