Onboard auto reset monitoring circuit. Onboard high-precision clock chip (DS3231SN) for providing accurate timing control. Support I2C communication and a 16-bit counter. Onboard the watchdog status indicator to warn the watchdog timeout. [Note] Do not include Raspberry Pi [Overview] This is an RTC WatchDog HAT (B) designed for Raspberry Pi with high-precision RTC and watchdog HAT, which refreshes and counts at a limited time and the watchdog circuit can reset the system. [Parameters] Communication interface: I2C RTC chip: DS3231 Watchdog chip: CH32V003 Power supply: 5V Dimensions: 30.5mm x 65mm Fixed hole diameter: 3.0mm [Designed For Raspberry Pi Series] Standard Raspberry Pi 40PIN GPIO Header, For Raspberry Pi Series Boards, Jetson Nano []for reference ONLY, the Raspberry Pi boards and Jetson Nano are NOT included. Due to different batches, the appearance, color and printed words of the product may vary, which will not affect the use. Colour:Blue Material:PCB Package Contents: 1 x RTC WatchDog HAT (B) 1 x 2x20PIN long row of seats 1 x Stud Pack 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.