1Small in size and exquisite in appearance, the programmable development module is convenient and beautiful to wear. 2The development board is used for the development and control of embedded system. 3The board is easy and simple to use and operate. Just connect the USB cable and connect to the computer, open the serial port driver folder, and install the CH340 driver. 4High quality material can make sure the durability and stability of the product. 5Precise production process and fine craftsman endow the board with good contact performance to ensure stable work. Item Type: Programmable Development ModuleMaterial: PCBWorking Voltage: DC 3.7VBattery Type: Polymer Lithium Battery (Built-In Battery)Battery Capacity: 500mAhPurpose: For The Development And Control Of Embedded Systems 1 x Programmable Development Module1 x Strap