Features:This decoding module is for mobile and fixed telephone voice dialing decoding function.It has 16 channels, 8 kinds of selectable output function, and leads to STD signal to use as a microcontroller interrupt signal.Very convenient to embed all kinds for mobile and fixed telephoneremote remote control, remote control decoding key value.12 channels outputs decode mobile and fixed telephone keys (0-9, x ).Another 4 channels output(ABCD) can use "DTMF Dial" Software control.Specification:Power Supply Voltage: DC 4.5V-5.5V(Typical 5V)Operating Temperature: -40-85IO Drive : Sink Current (Low level drive) 20mA, source current(High level drive) 270uA16 Channel selectable high and low level output.16 Channel output: 0-9,x ABCD8 kinds of Mode selectionPCB Size: 50x20mm or 1.97x0.79inWeight: Approx. 18gPackage list:1 x 16 Channel DTMF Decoder Module1 x Male to Male Audio Wire (3.5mm jack )