FainWan 12V 8 Channel Relay Module with OPTO-Isolated High and Low Level Trigger 8 Ways Relay Switch Module Compatible with Ar-duino auspowers_batchthree 2X Telephoto What It Does:

2X Telephoto What It Does: Brings you two times closer to your subject without moving an inch

rotatable structure allows both ears to be worn

there is clear instruction on the back cover

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FainWan 12V 8 Channel Relay Module with OPTO-Isolated High and Low Level Trigger 8 Ways Relay Switch Module Compatible with Ar-duino auspowers_batchthree 2X Telephoto What It Does:FainWan 12V 8 Channel Relay Module with OPTO Isolated High and Low Level Trigger 8 Ways Relay Switch Module Compatible with Ar duino Description : 1. The module uses genuine quality relay, normally open interfaces Maximum load : AC 250V 10A, DC 30V 10A; 2. Using SMD OPTOCOUPLER isolation , driving ability , stable performance ; trigger current 5mA; 3 . The module voltage is 12V; 4 . Each way module can be set high or low triggered by jumper ; 5 .