The TTD-4 decodes up to an 8-digit DTMF sequence. These 8 digits can be any of the 16 standard DTMF tones. DTMF codes are selectable via dipswitches. Upon decode, this product can turn on a horn relay, light, callswitch, etc. The TTD-4 can also be configured to reset by command or automatically.

• Can transpond a 2400 Hz tone
• Group call & all call operation
• Momentary & latched outputs