Function: 1. 0.96in OLED: The 0.96-inch OLED display intuitively shows the time for easy reading, clear and convenient. 2. Not Easy to Get Dry Solder Joints: Utilizing sophisticated manufacturing technology, it's not prone to dry solder joints, making it suitable for electronic equipment and DIY projects. 3. Connect to Other Device Modules for Development: The leads can be connected to other device modules for development, making it user-friendly. 4. Five Buttons: A five-way button connected to five pins corresponds to five buttons, offering good performance. 5. MicroUSB Automatic Programming: Features a MicroUSB automatic programming function, allowing you to charge the battery and program the ESP8266 via the MicroUSB interface. Specification: Item Type: ESP8266 Clock Module Material: PCB Battery Type: CR1220 button cell battery Battery Capacity: 150mAh Purpose: Use the MicroUSB interface to charge the battery and program the ESP8266. Applicable Scenarios: Electronic equipment, electronic DIY. Package List: 1 x ESP8266 Clock Module 1 x Pin Header Note: 1. Remove the 18650 lithium battery during programming to avoid programming errors. It's best to use a charging current of 500MA to 1A for USB charging. Excessive current can cause the charging chip to generate significant heat. 2. Install the battery with the correct positive and negative poles. Incorrect installation will damage the charging chip and could potentially cause the battery to explode. Please be extra careful!