Features: Electronic watch with open-source hardware and software, a unique timing watch, and a wearable development platform that reserves port, allowing users to connection. Low power electronic paper 1.54inch display screen, with a resolution of 200x200 and a wide viewing angle. It supports WiFi and bluetooth-compatible connections, and can connection to Internet (such as weather, news, traffic, map.) and devices that support bluetooth-compatible. Real time clock, with calendar and alarm functions, can accurately time. Build in USB to serial adapter for programming. Specifications: Material: Metal/Printed Circuit Board Type: metal housing, circuit board housing (optional) Watch Plate:about 45x34x10mm/1.77x1.34x0.39" Watchband: about 24x250mm/0.94x9.84" Model: WATCHY 2.0 PLUS Screen: 1.54" Resolution: 200x200 Battery: 3.7V 200mAh Package Includes: 1Pc Watchy 2.0 Plus Programmable Watch 1Pc Watchband 1Pc USB Cable note: Please make sure to choose hardware version 2.0 when flashing the device. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.