ITEM NAME:Relay Module K2P9 Relay Module K2P9 Brand new and high quality Can be used with Arduino Special Sensor Shield V4.0 Be able to control various appliances and other equipments with large current Easy to be controlled by a lots of Microcontrollers like Arduino, 8051, AVR, PIC, DSP, ARM, MSP Size Name: 5V 2-Channel Color: blueï ¼Å’black Dimension: Approx. 5x3.8x1.7cm Materials: PCB board and electronic components package contents:1 x 5V 2 channel 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..Materials: PCB board and electronic components. Color: blueï ¼Å’black.