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Aiman
Aiman Great comment about the 8v min, voltage use. You can get extra 433MHz relays like these:Excellent comment esp. about the min. 8v use; You could get these if you needed more 433MHz wireless relays:Product ID: 1101048http://www.banggood.com/2Pcs-DC12V-10A-1CH-433MHz-Wireless-Relay-RF-Remote-Control-Switch-Receiver-p-1101048.html