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AEDIKO 4pcs DC 24V Relay Module 1 Channel Relay Board with Optocoupler Isolation Support High or Low Level auspowers_batchone you dont have to worryAEDIKO 4pcs DC 24V Relay Module 1 Channel Relay Board with Optocoupler Isolation Support High or Low Level Specifications: Channel: 1 ChannelWorking Voltage: DC 24VAction Time (Under Rated Voltage): Less Than 10msRelease Time (Under Rated Voltage): Less Than 5msNormally Opened Compatible Load: 10A 250VAC 15A 125VAC 10A 30VDC Read more Output Interface: Normally Opened (NO) : Normally Open Pin of Relay. NO Pin is Not Connect to COM Pin When Relay Off.