A Universal Relay Board Kit with 16 Relays and Connectors included! Transformer included. The 12V DC output can be used as a power supply for other kits. Each outlet can be equipped with a noise suppressor.

TOSR08 - Relay Module 8 channels USB / Wireless 5V

TOSR02-T - USB / Wireless 5V 2-channel Relay Module Support for temperature sensor

Velleman Coded Lock Kit.

Solid State Relay - 8 Channels

In/Out Shield for your Arduino, Velleman.

The Hexa base rotation kit is perfect for rotating a large mass. It can easily support 5kg . It is injection molded from ultra strong ABS plastic .

DFRobot Relay Shield  V2.1 is a completely new design which is capable of controlling 4 relays at a time.

This relay shield is capable of controlling 4 relays . The maximum switching power can be 360VA / 90W . It can be controlled directly by the Arduino by means of digital IOs digital with external power of 9v . With integrated xbee socket and APC220 socket, it can be controlled wirelessly via Xbee / bluetooth / APC220 . Make it an ideal solution for home automation and robotics.

Shield of relays for Arduino, with 2 channel mechanical relays and with 2 channel MOS switch , providing an easy way for applications low and high voltage control. 

8 relay module with ports " NC " means " Usually connected to COM " and ports "NO" means " Usually open to COM ".

Mini Rboard ATMega328P

Stem Shield for your Arduino, the Velleman.

ESP8266 WiFi Remote Control Module with 220V Relay

Pololu RC Switch with Relay