ITEM NAME:1x relay module optocoupler isolation module low voltage control high volta P4J1 1x relay module optocoupler isolation module low voltage control high volta P4J1 Can control 10A 250VAC, 10A 30VDC load with an output signal indication. can directly access the microcontroller output. anti-interference ability, with optical isolation with diode freewheeling protection the response time is less than 20 milliseconds long relay life can be continuous pull 10 million times the external connection using rotary crimp terminals, so that wiring more solid. there are fixed mounting holes around. Size: Length 56.5mmX Width 16.8mmX Height 20mm Material: metal Color:black Package included: 1 pcs Relay module Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Anti-interference ability, with optical isolation. 1 pcs Relay module. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.