Adafruit DS3231 Precision RTC Breakout Compatible With_Raspberry Pi 3 Comes with a few horns

Comes with a few horns and hardware

+5 to +20 dBm adjustable power output (up to 100 mW)

SN74AHCT1G08 - Single 2-Input AND Gate

This boost circuit can sometimes cause a squeaking or buzzing sound

So it's a fancy pants Wireless UART Adapter

Adafruit DS3231 Precision RTC Breakout Compatible With_Raspberry Pi 3 Comes with a few hornsThe DS3231 Precision RTC Breakout delivers highly accurate timekeeping with built in temperature compensation and battery backupperfect for clocks, data logging, and projects that need reliable time even without power. The datasheet for the Adafruit DS3231 explains that this part is an "Extremely Accurate IC Integrated RTC TCXO Crystal". And, hey, it does exactly what it says on the tin! This Real Time Clock (RTC) is the most precise you can get in a