This is a module wih a low power device DTMF decoder chip. It is a complete DTMF receiver integrating both the band-split filter and digital decoding functions. This module is suitable for modem interfaces, mobile radios and  other DTMF related applications.

Specifications

• On-board MT8870 frequency decoder chip
• On-board audio input interface
• On-board LED lights for output state indication
• PCB Size: 26.5 x 24.5 mm
• Onboard 5 LED indicators for easy viewing output state
• DC Power Supply Voltage：5V(4.5V-5.5V)
• Operating Temperature : -40 to +85 °C
• IO Drive : Current Maximum 10mA.