Gravity: 16A Relay Module For Arduino wiki- DFRobot

wiki:A relay is an electrically operated switch, which has a control system and the controlled system, usually used in automatic control circuit.

Gravity: Easy Switch Module - DFRobot

Gravity: 16A Relay Module For Arduino - DFRobot

16 Channel 5V Relay Module 10AMP

DFRobot Gravity Magnetic Latching Relay Noiseless for Smart lighting sockets switch Arduino ESP32 Raspberry Pi LattePanda - AliExpress

Ethernet Controlled 8 Channel Relay 16A - DFRobot

Gravity: Magnetic Latching Relay Module for ESP32 / Arduino - DFRobot

Gravity: 16A Relay Module For Arduino wiki- DFRobot

Relay_Module__Arduino_Compatible___SKU__DFR0017_-DFRobot

1 Channel 5V Relay Module

Relay module Iduino 4 channels - 10A/250VAC Botland - Robotic Shop

Gravity __Digital_Relay_Module__Arduino_&_Raspberry_Pi_Compatible__SKU__DFR0473- DFRobot

Gravity: Digital 5A Relay Module for Arduino - DFRobot