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Relay Module Relay Power Switch Module, One Channel Relay Module Board High/Low Level Trigger with Optical Isolation Relay Module 30A YYG-2 1 Relay Module with Optocoupler(12VDC) auspowers_batchsix Then put the paper towelRelay Module Relay Power Switch Module, One Channel Relay Module Board High Low Level Trigger with Optical Isolation Relay Module 30A YYG 2 1 Relay Module with Optocoupler(12VDC) Features: 1. 100% brand new and high quality. 2. Made of the high quality miniature optocoupler, anti interference ability, stable performance 3. Adopt 9. 5mm black barrier terminal and standard 30A terminal which is stable and reliable. 4. High low level trigger can be