WIFI:NoDSP:- DAC:- Dimensions (WxHxD):- Body Material:plastic Bluetooth:Yes Supports EBook Reading:No Operation Mode:Touch Tone Storage Type:Flash Memory Have Speakers or not:Yes Supports FM:Yes Battery Specification:External Power Signal Noise Ratio:89dB Supports Recording Function:Yes Display Size:None Package:No Function:Voice Recorder,FM Radio,bluetooth,Build in Speaker Model Number:Wireless Bluetooth mp3 decoder board Style:Pure Audio MP3 Battery Life:> 20 hours Screen:Yes Balanced Out:No External Memory:Yes Audio Format Support:MP3, WAV,FLAC,ape,WMA Origin:Mainland China Certification:CE battery:no include DC 5V 12V 15W Amplifier MP3 WMA Decoder Board Bluetooth 5.0 MP3 Player DIY Shell Box Support USB TF FM Audio Module Recording 2X15W Amplifier Power amplifier with call and recording, power amplifier 2*15W, voltage range 7V-18V USB: Connect U disk (maximum support 32GB) LED: digital screen display, showing red Infrared receiver module TF: Connect TF memory card (maximum support 32GB) AUX: Audio input interface VOL-: Short press to select the previous song; long press to decrease the volume PLAY/PAUSE: Short press is to switch between pause and play; long press is to radio FM automatic station VOL+: Short press to select the next song; long press to increase the volume MODE: Switch of USB/TF/FM/AUX/BLUETOOTH sound; long press the recording function, long press again to play the recorded file; Bluetooth version is 5.0 Music Format: MP3/WMA/WAV/APE/FLAC No Amplifier Voltage 5-12V are universal FM radio 87.5 MHz-108 MHz USB: Connect U disk (maximum support 32GB) LED color screen: digital screen display, showing red Infrared receiver module TF: Connect TF memory card (maximum support 32GB) AUX: Audio input interface VOL-: Short press to select the previous song; long press to decrease the volume PLAY/PAUSE: Short press is to switch between pause and play; long press is to radio FM automatic station VOL+: Short press to select the next song; long press to increase the volume MODE: Switch of the sound of USB/TF/FM/LINE IN/BLUETOOTH About the structure: Panel size: 107 * 25 MM, the two corners of the panel and the screw hole positions, then the cover cover the surface, the depth of the board is 32 MM Recording function description 1. Long press the MODE button to start recording, and long press the MODE button again to cancel the recording function; 2. Long press the PLAY/PAUSE button to play the recording file; 3. When recording, it is necessary to connect a storage device, such as: U disk or TF card;