1. It Has The Function Of Lithium Battery Charging And Discharging Path Management: When The Typec Data Line Is Inserted, The Data Line Supplies Power To The Microcontroller And The Display. The Lithium Battery Only Charges But Does Not Discharge At This Time. Charging Will Stop When The Lithium Battery Is Fully . When The Typec Data Cable Is Pulled Out, The Lithium Battery Is Immediately Switched To Power The Microcontroller, And There Will Be No Power-Off Reset. 2. It Has An Attitude Detection Sensor That Can Detect The Attitude Of The Watch And Write Programs To Create Rich Application Functions. 3. Has 3 User Buttons + 1 Download Button. It Is Convenient To Write User Programs And Implement Program Download Functions. 4. 1.28-Inch Round Tft Display 240*240 Pixel High-Definition Ips Screen 5. Can Support 602030 Model Lithium Battery. 400mah Can Keep The Screen On For About 6 Hours Of Standby. The Maximum Charging Current Is 600ma, And It Only Takes 45 Minutes To Fully Charge The Battery. Instructions For Use Configure The Development Board MicroPython Environment First Press And Hold The Boot Button On The Development Board, And Then Plug In The Usb Cable. At This Time, The Computer Will Display An Extra Drive Letter. Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Black Material:PCB Size:Board size:about 45x42mm, height after installation:14mm Package Contents: 1 * Round Watch Upper Plate 1 * Round Watch Lower Plate 1 * Strap Only the above package content, other products are not included. Note: Light reflection 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.