Features: brand new and high quality Lossless Mp3 D decoders board power amplifier mp3 player audio module is with 5V for DC input, connect with universal micro USB for power supply, convenient to connect with common mobile phone charger or power bank. DIY Speaker with 3.5mm audio output jack, super easy to enjoy audio with 3.5mm earphones; Wireless audio receiver board able to use with 3.5mm audio input amplifier, wonderful to add bluetooth-compatible function to your amplifier or amplifier board. This mp3 decoder board decoding player module is with aux and bluetooth-compatible chip, mini receiver module for TF card, USB and bluetooth-compatible; Easy to connect with bluetooth-compatible audio receiver board with smartphones, tablets and other electronics Mp3 decoder board with controlling buttons, contain Mode, for Play, Next, Back button, you can choose your favourite sound effect. The mp3 decoder board module for DC 5V Support TF Card USB is suitable for car, phone, amplifier, home stereo theater, also for ideal to DIY audio system. Specifications: Material:PCBA Power Supply Voltage: 5V/3.7V　　　　　　　 Frequency Response: 10-20000 (HZ)　　　　　　 Signal to Noise Ratio: 80 (DB) 　　　　　　　　 Output Power: 3Wx2　　　　　　　　　　 Load Impedance: 2-3 Ω Size: Approx. 57x57mm/2.24x2.24 inches Package Includes: 1x Amplifier Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.