PLC-RSC- 24DC/21 Relay Module 20 ohm smd resistor The HC-12 is the easiest

The HC-12 is the easiest way to transfer data over the air between two Arduino

It's a CD017 decade counter IC in DIP package

The NEO-6M GPS Module has a backup battery and an EEPROM for storing setup information

Operating voltage supply 2

Operating Voltage 16V  Max

PLC-RSC- 24DC/21 Relay Module 20 ohm smd resistor The HC-12 is the easiestIts PLC INTERFACE, for installation on DIN rail NS 35 7,5, 1 changeover contact, input voltage 24 V DC, composed of a plug in miniature relay with power contact and a basic terminal block PLC BSC 21 with screw connection. 6. 2 mm PLC basic terminal block with screw connection, without relay or solid state relay, for mounting on DIN rail NS 35 7,5, 1 changeover contact, input voltage 24 V DC Features Slim design Efficient connection to system cabling