Brand N/A Model N/A Quantity 1 Color Blue + black Material PCB Features Compatible with electronic bricks and sensor extension board Specification Interface: 3-Pin / 4-Pin; Voltage: 5V; Electronic brick of relay can be connected to digital I/O port when the input of S port is low level relay will be under disconnect state; when the input of S port is high level relay will be under connect state. It can be connected in series to the LED lights buzzer or even the loop of a small lamp so as to control the state of the switch. Application Arduino electronic bricks English Manual/Spec Yes Packing List 1 x Module