Specification Brand : KNACRO BulletPoint1 : This module uses genuine quality relay, normally open interfaces Maximum load: AC 250V/10A, DC 30V/10A BulletPoint2 : Using SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA BulletPoint3 : This module can be high or low by a jumper setting trigger BulletPoint4 : Fault-tolerant design, even if the control line is broken, the relay will not operate BulletPoint5 : If you need more technical support, just contact us on AMAZON! Color : Blue Knob CurrentRating : 10 amps Department : unisex-adult ExternallyAssignedProductIdentifier : 8885598125593 ExternallyAssignedProductIdentifier1 : 713653015849 ExternallyAssignedProductIdentifier2 : 0713653015849 ItemName : KNACRO 4-Channel 10A Relay Module DC 24V with Optocoupler Isolation High Low Level Triger ItemPackageDimensions_Height : 20.3 centimeters ItemPackageDimensions_Length : 3.8 centimeters ItemPackageDimensions_Width : 6.6 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : solid-state-relays Manufacturer : KNACRO Material : lead MaximumSwitchingCurrent : 10 amps MaximumSwitchingVoltage : 250 volts MeasurementSystem : Metric ModelName : QAXIOQCS ModelNumber : a16081800ux0807 MountingType : Wall Mount NumberOfItems : 1 OperationMode : Automatic PartNumber : a16081800ux0807 ProductDescription : 1. The module uses genuine quality relay, normally open interfaces Maximum load: AC 250V/10A, DC 30V/10A; 2. Using SMD optocoupler isolation, driving ability, stable performance; trigger current 5mA; 3. The module Operating voltage 24V; 4. The module can be high or low by a jumper setting trigger; 5. Fault-tolerant design, even if the control line is broken, the relay will not operate; 6. The power indicator (green), the relay status indicator (red) 7. The interface design of human nature, all interfaces are available through a direct connection terminal leads, very convenient 8. Module size: 73mm*50mm*17mm (L*W*H) Module interface: 1. DC+: positive power supply (VCC) 2. DC-: negative power supply (GND) 3. IN1,IN2,IN3,IN4: can be high or low level control relay S1,S2,S3,S4, HIGHT OR LOW LEVER Relay outputs: 1. NO1,2,3,4: normally open relay interface 2. COM1,2,3,4: Common Interface Relays 3. NC1,2,3,4: normally closed relay interface High and low level trigger options: It is low level trigger when jumper connect to LOW pin It is high level trigger when jumper connect to HIGH pin