UNIT RTC is a programmable real-time clock module, integrated HYM8563 low-power CMOS real-time clock/calendar chip, using I2C communication interface, full-coverage case can effectively protect the circuit, making its operation more stable. Applicable to a variety of embedded devices, instruments and instruments as a system clock. Features: *Support second/minute/hour/day/month/year. time data reading and writing *32.768kHz high-precision clock crystal, greatly reducing the time error *Low power consumption, coin battery can work continuously for years *With century mark *I2C communication interface Applications: Clock, alarm clock Power down time synchronization Specifications: Clock Chip: HYM8563 Crystal Frequency: 32.768kHz Communication Interface: I2C, addr: 0x51, maximum bus speed 400Kbps Power Supply Voltage: 5V DC Color: White Material: plastic Package Contents: 1x Unit RTC 1x HY2.0-4P cable 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.