1.Easy to use and funny. 2.standard electronic building blocks Interface 3.Power supply is 3 - 5VDC 4.4 M2 screw positioning holes for easy installation note:The Rocker Switch Module is based on two feet 2 files rocker switch control module, the output of a switch, the switch that outputs a high level when you the ON side, that output low when pressing the OFF side. SCM system is suitable for 3.3V and 5V, it can be use with the board compatible for . Especially suitable for DIY projects. Color: As Shown Material: plastic Package Contents: 1 x Switch Module Only the above package content, other products are not included. Note: Light reflection 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.