5 Volt relay interface boards. Available as 1, 2 or 4 on-board relay modules. Module Sizes (+/- 1mm): 1 Relay Module: 53mm by 29mm, height 20mm 2 Relay Module: 52mm by 39mm, height 20mm. Use the dropdown above to choose 1 Relay, 2 Relay or 4 Relay module.
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