bluetooth Audio Power Amplifier 220V USB SD 2* Mic inputSpecifications:Model: 505ATSize: 25x19x8cm/9.8x7.2x3.1Rated voltage: 220VFrequency Response: 20KH - 20KHz(10dB)Input sensitivity: 150-300mv ( 30mv)Tone Control: TREBLE: 10db at 10KHzMID: 8db at 1KHzBASS: 10db at 100KHzSurround Effect Control: 0-10dBSignal to noise ratio:80dBLoudness: +6dB at 100Hz. +6dB at 10KHzLoad Impeckance: 4 to 8 ohmAUX Input: SupportColour: BlackFeatures:1. Power supply: AC 220V conversion input.2. Built-in bluetooth receiving function, USB playback and SD card playback and FM playback.3. Audio 1 group CD input function.4. Two-way karaoke Mic input, digital reverb effect adjustment function.5. Main channel high and low tone function.6. With remote control, remote control built-in decoding function operation.7. Stereo power amplification output, can be connected to a pair of 4 ohm - 8 ohm speakers.8. The rear panel has a set of LINE outputs for connection to an active subwoofer.Packaged included:1 x Audio Power Amplifier1 x Remote control1 x External antenna1 x User ManualNote:1.The USB Disk/Max 64GB SD Card is not included in the package.2. Please allow 0.5-1cm differences due to manual measurement.3. Due to the light and screen difference, the items color may be slightly different from the pictures.