20pcs 5V Low Level Trigger One 1 Channel Relay Module Interface Board Shield DC AC 220V COD

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1. High level flip-flops shows that there are trigger mode of the voltage between the signal input terminal and the ground; That is to say it is a way of short circuit trigger between signal input and VCC positive pole.  2. Low level flip-flops shows that there are voltage for OV trigger mode  between the signal input terminal and the ground. In a word, it is a way of short circuit trigger between signal input and GND negative pole. 3. Please allow 1-3mm differs due to manual measurement. 4. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understand 20 x 1 Channel Relay Module