New from Delta Electronics, the EC2 ECHO BOARDFrom the same designer and makers of the widely acclaimed Delta M2 microphones is the newest, most innovative Echo Board ever brought to market! No echo board is as simple to install with only 4 wires for connection into almost any radio. Unmatched Echo sound giving you that BIG BOOMING THEATRE ECHO SOUND!! Its Micro Size at only 5 x 5 cm (2 inches x 2 inches) is so small it can easily be put into almost any radio. Simply wire up 4 WIRES to your mobile or base radio and experience ECHO that will make you sound like you were transmitting from the Grand OLE Oprey!!! Wire to RED, BLACK, Audio IN and Audio OUT and your all done!! With the included dual knob mounted on your radio you can shut off and control the echo. On the board is a red LED that will light when power is given confirming you've installed it all correct!