10pcs/lot A87 4 roads Optocoupler isolation module high-low level expansion board electronic building blocks for Arduino
![10pcs/lot A87 4 roads Optocoupler isolation module high-low level expansion board electronic building blocks for Arduino](http://ae04.alicdn.com/kf/HTB12ShbhVooBKNjSZFPq6xa2XXae.jpg)
sku: 32884458377
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$20.99
Shipping from: China
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