support MP3 format, power automatically play, play the status of the red LED update. support U disk (tested over 32G), TF card (tested 16G) playback mode; power default TF card mode, if the TF card does not exist automatically jump to U disk mode, and both devices are installed, you can manually Set the playback mode, please refer to the key operation instructions. button to adjust the up and down track switch, volume + -, pause / play, mode switch, Note: "long press" time about 2S If you use U disk mode, the proposed 5V power supply, some U disk does not support 3.7V power supply. Product specifications Power supply range: 3.7 ~ 5.5V Product Size: 45x 36mm Anti-static bag refined packaging, to avoid damage to the way of delivery static electricity. Material: metal+PCB colour: blue Exquisite double-layer board design, large area copper plating, stable and reliable. Package Contents: 2 * mp3 decoding module Note: 1. "Long press" time is about 2S 2. If you use U disk mode, 5V power supply is recommended, some U disks do not support 3.7V power supply. Only the above package content, other products are not included. Note: Light 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. 2 pcs Mp3 Decoder Board product description:1. Support MP3 format, auto play when power on, red LED indicator is updated when playing;2. Support U disk (tested 32G), TF card (tested 16G) playback mode; power on default TF card mode, if there is no TF card automatically jump to U disk mode, and both devices are installed, you can manually Set the playback mode, please refer to the key operation instructions for details. 3. The buttons can adjust the up and down track switching, volume +-, pause / play, mode switching, please see the button operation instructions for details;4. You can press the button to set the "single / full song" cycle, the default is the full at power-on, press the "Repeat" key to change the cycle mode With Micro-USB power supply interface, it can be powered by mobile power supply or USB charger through the mobile phone data cable. It can also use 3.7V lithium battery and USB 5V power supply.Support TF card (mobile phone storage card), U disk playback mode;There is no need for welding with horn terminal, which is convenient for wiring;Modular design is easy to modify. Super sound quality, onboard 2W mono amplifier (5V power supply up to 3W) directly connected to the speaker (recommended with 4 ohm 3W speaker), 3.5mm gold-plated headphone jack can be connected to headphones or external audio.