CTCSS ENCODER FOR OLD TRANSCEIVER,REPEATER,LINK,ETC.GENERATED WITH PIC MICROPROCESSOR ALL SET OF 51 STANDARD SUB TONES AND 1000,1750,1800,1200,2200,800,900,1100,1300,1500,2000,2500,3500HZ.THE SELECTION SWITCH IS DIP SWITCH.SIZE IS 3 X 2.6CM.VOLTAGE:5V CURRENT: 2.5mA. FOR MORE INFORMATION PLEASE CONTACT ME. FOR MORE DETAIL'S PLEASE DOWNLOAD :ctcss.pdf