Feature:1. Small in size and exquisite in appearance, the programmable development module is convenient and beautiful to wear.2. The development board is used for the development and control of embedded system.3. The 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.4. High quality material can make sure the durability and stability of the product.5. Precise production process and fine craftsmanship endow the board with good contact performance to ensure stable work.Specification: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.Package List:1 x Programmable Development Module1 x Strap