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Amazon.co.jp: S-TING I2C RTC DS1307 AT24C32 Real Time Clock Module AVR ARM PIC Tiny RTC I2C Module Memory DS1307 Clockboard Computer : Computers
RTC (リアルタイムクロック) (DS1307)
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CentIoT - RTC I2C Module - DS1307 AT24C32 Real Time Clock Module for arduino AVR ARM PIC - Without Battery : Amazon.in: Computers & Accessories
2PCS DS3231 AT24C32 IIC RTC Module Clock Timer Memory Module Beats Replace DS1307 I2C RTC Board with Male to Female Jumper Wire Cable at Amazon.com