Features:Model: 1 Channel, 2 Channels, 4 Channels, 8 Channels (Optional) , * 5v 1 Channel Solid State Relay Module: 5V 240V 2A DC State Relay, 240V 2A Resistive Fuse Output. Size: 25*34*25 (Length*Width*Height) Weight: 13g Input Power: 5V DC (160MA)Control Signal Input Voltage:0V-0.5V Low Level (SSR off)2.5V-20V High Level (SSR On)Module Interface:Input Part:DC+: Positive Power Supply (Relay Voltage Powered Supply)DC-: Connect to the Negative Power PoleCH: Relay Module Signal Trigger Has Expired (Low Level Trigger Is Valid)* 2 Channel Solid State Relay Module: Size: 55*33*25 (Length*Width*Height) Weight: 21.5g Input Power: 5V DC (160MA)Control Signal Input Voltage:0V-0.5V Low Level (SSR off)2.5V-20V High Level (SSR On)Module Interface:Input Part:DC+: Positive Power Supply (Relay Voltage Charged)DC-: Connect to the Negative Power PoleCH: Relay Module Signal Trigger Has Ended (High Level Trigger is Valid)*4 Channel, solid state relay module5V solid state relay 240V 2A, output with resistive fuse 240V 2A. Size: 57*55*25 (Length*Width*Height) Weight: 40g Input Power: 5V DC (160MA)Control Signal Input Voltage:0V-0.5V Low Level (SSR off)2.5V-20V High Level (SSR On)Module Interface:Input Part:DC+: Positive Power Supply (Relay Voltage Powered)DC-: Connect to the Negative Power Pole CH1: 1 End of Relay Module Signal Trigger (High Level Trigger is Valid)CH2: 2 End of Relay Module Signal Trigger (Trigger CH3: 3 Relay Module Signal Trigger End (High Level Trigger is Valid)CH4: 4 Channels Relay Module Signal Trigger End (High Level Trigger Is Valid)* 8 Channel Solid State Relay Module5V Omron 240V 2A Solid State Relay, 240V 2A Resistive Fused OutputMeasure: 103*53*21mm/4.05*2.08*0.82"Input Power: 5V DC (160mA)Control Signal Input Voltage:0V-0.5V Low level (SSR off)2.5V-20V high level (SSR on)2.54cm pin and blue KF301 terminal are more convenient to connect to the control wireModule interface:Input part:DC+: positive power supply (relay supply voltage)DC-: connect to the negative power poleCH1:1 signal triggers the end of the relay module (low level trigger is valid)CH2: 2-way relay module signal trigger terminal (low trigger is valid)CH3: 3-way relay module signal trigger terminal (low trigger is valid)CH4: 4-way relay module signal trigger terminal (low trigger is )CH5: 5-way relay module signal trigger terminal (low trigger is )CH6: 6-way relay module signal trigger terminal (low trigger is )CH7: 7-way relay module signal trigger terminal (low trigger is )CH8: 8-Relay module, signal trigger terminal (low trigger is )Voltage version: quiescent current, working current, trigger current, trigger voltage:1 way 5V 0mA 13.8mA 0-2.5V 2mA2 channels 5V 0mA 26.8mA 0-2.5V 2mA3 channels 5V 0mA 37mA 0-2.5V 2mA4 channels 5V 0mA 48mA 0-2.5V 2mA5 channels 5V 0mA 59mA 0-2.5V 2mA6 channels 5V 0mA 70mA 0-2.5V 2mA7 channels 5V 0mA 81mA 0-2.5V 2mA8 channels 5V 0mA 90mA 0-2.5V 2mA Unit package:1*channel semiconductor module Relay (Optional)Notes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.