SMAKN&reg; DC 12V 2CH 2 Channel Isolated Optocoupler High/Low Level Trigger Relay Module Product Name : Optocoupler Driver Relay Module; Relay Type : SRD-12VDC-SL-C Coil Voltage : DC 12V; Pole Number : 2 Channel Weight : 33g;Package Content : 1 x Optocoupler Driver Relay Module