PC Accessory: SunFounder 2 Channel 5V Relay Shield Module for Arduino UNO 2560 1280 ARM PIC AVR STM32 Raspberry Pi - SunFounder

Personal Computer: Kootek? 2-channel 5V Relay Module for Arduino DSP AVR PIC ARM - Kootek

Car Audio or Theater: SainSmart 2-Channel Relay Module - SainStore Inc.

Car Audio or Theater: SainSmart 5V 2-Channel Solid State Relay Board for Arduino Uno Duemilanove MEGA2560 MEGA1280 ARM DSP PIC - SainStore Inc.

Speakers: Docooler 5V Active Low 2 Channel Relay Module Board for Arduino PIC AVR MCU DSP ARM - Docooler

Car Audio or Theater: Arrela? 2-channel 5v Relay Module with Optocoupler for Arduino DSP AVR PIC ARM - Arrela Tech.

Car Audio or Theater: SainSmart 4-Channel Relay Module - SainStore Inc.

CE: SMAKN? 24V 2-Channel Relay Module H/L Level Triger Self-Lock/Interlock for Arduino Rasp - SMAKN

Car Audio or Theater: SainSmart UNO R3 Starter Kit with 18 Basic Arduino Tutorial Projects for Beginners (1602 LCD & Prototype Shield & 2-Channel 5V Relay included) - SainStore Inc.

CE: SMAKN? 5V 2-Channel Relay Module H/L Level Triger Self-Lock/Interlock for Arduino Rasp - SMAKN

PC Accessory: SainSmart iMatic 8 Channels Relay I/O Remote Control Controller Module, RJ45 Interface, Compatible with Arduino, Android iOS Device Control Under WiFi Connected Network (Controller Module + 8-CH Relay) - SainSmart

Toy: SainSmart Nano V3 Starter Kit for Arduino (1602CLD + Prototype Mini Breadboard + 2-Channel 5V Relay Module included) With Tutorial Instruction Manual on Basic Arduino Projects - Sain Store Inc

PC Accessory: SainSmart 2 Channel SSR 5A DC-DC 5V-220V Solid State Relay for Arduino Mega UNO - SainSmart

CE: 5v 10a 2-channel Relay Module Shield for Arduino ARM PIC AVR DSP Electronic - FlyFun

Car Audio or Theater: SainSmart 16-Channel Relay Module - SainStore Inc.

PC Accessory: 12V 2 Channel Relay Module Board for Arduino 8051 PIC ARM DSP AVR MSP430 TTL Raspberry Pi - DBPOWER

PC Accessory: RioRand 5V Relay Module 2-Channel, With Optocoupler Protection - RioRand

PC Accessory: BeesClover 2 PCS 5V 4-Channel Relay interface board + 12 pcs 1P dupont cable 200mm female to female , and each one needs 15-20mA Driver - beesclover

BISS: SainSmart 2 Channel Solid State Relay Module 3V-32V 5A For Arduino UNO MEGA AVR DSP *4000 VRMS Isolation Voltage* - Sain Store

PC Accessory: SainSmart C97 Kit with MEGA2560 R3 Black + 3.2" TFT + TFT Shield + USB Cable for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot XBee ZigBee - Sain Store Inc

The above is "Arduino 2 Relay Module Schematic - 2 Relay Module Arduino - 2 Relay Arduino" recommended related products, Please click on the picture to see product details and 2 relay arduino reviews!