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