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MP3 player
A valid transmission in indicated by a high signal at VT pin
Use heat-shrink tubing to insulate solder joints
LED ON/OFF Indicate
Dual USB 5V 1A 2.1A PCB Power Module with LCD HCSR04 MP3 playerDual USB 5V 1A 2. 1A PCB Power Module with LCD This is the Dual USB 5V 1A 2. 1A Digital LCD 18650 Lithium Battery Charging Module Accessories, 18650 Circuit board shell. Meet the individual needs of your DIY, but you must understand basic electronic assembly. The motherboard comes with protection Charging, overcharge protection, over discharge protection, and overcurrent protection. An intelligent output device after charging full, automatically stop