<p>Product name: Watch ESP32 programmable open source electronic watch<br/><br/>Product color: black<br/><br/>Screen size: 1.54in<br/><br/>Product resolution: 200×200<br/><br/>Features:<br/>1. -low power e-paper 1.54-inch display with a resolution of 200x200 and a wide viewing angle<br/>2.Wi-Fi and Bluetooth LE connection<br/>3.3 Heart rate meter for axial hearing testing<br/>4. Real-time clock with calendar and alarm functions for accurate timing<br/>5. Built-in USB serial port to firmware, can be programmed anytime and anywhere<br/>6. Vibration motor for alarm<br/>7. Four buttons (use imported buttons, which feel better)<br/>8. Open source hardware and software<br/>9. Tons of examples and cool looks<br/>10. Open source 3D case design<br/>11. Built-in 3.7V 200mAh battery<br/>12. The PCB lower cover is used to better protect the screen, battery and various PMP battery life on the motherboard.<br/><br/>What to use: Watch wakes up every 60 seconds, checks the accelerometer, real-time clock, and updates the e-paper display with the latest information. WiFi is turned on during certain hours to obtain weather data. The 's battery life should be 5-7 days for timekeeping only, and 2-3 days for data acquisition over WiFi. These numbers can be expanded with further optimization (e.g. sleep during off-hours, only get up when exercising/waking up, etc.)<br/><br/>User Manual: Please scan the QR code on the product packaging<br/><br/>Special note: Please be sure to select the hardware version V2.0 when flashing<br/><br/>Product gross weight: 72g<br/><br/>Package includes: Watch*1 V2.0 *1 (built-in 200mAh battery) Logic strap*1 USB data cable*1</p>