Realacc TFP-Mini Triple Feed Patch Dia. 45mm 5.8G 8dBi FPV Flat Panel Pagoda Antenna With Terminator
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This is a real time clock (RTC) based on IC DS1307 that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost.
Use for data-logging, clock, timers and alarms.
The DS1307 can be easily connected to the Arduino, with I2C bus interface.
1 x Real Time Clock Module with battery