This is an intro of 2 channel RS-232 based Relay Board Module from Iknowvations. These boards are best if you want to operate any electrical equipment by PC. Best for home automation. You can use it with any microcontrollers like AVR, PIC, 8051 or ARM. For more information please visit http://iknowvations.in. You can also buy these 2 channel Relay boards modules from http://shoppee.iknowvations.in