Feature:1. The module is designed do select the keyboard and MCU interface. 2. The module can instruct the MCU (or keyboard) to generate 16 double tones with Audio 1/2. 3. Wide voltage range, it can be connected with voltage from 524VDC. 4. The module is equipped with two audio plugs 3.5mm do of the same time. 5. There are 7 MCU input interfaces on the module. . AE11A04 DTMF Voice Audio Generator Module Dual Specification:Features: The module is designed do dialing keyboard and MCU interface. The module can instruct the MCU (or keyboard) to generate 16 double tones with Audio 1/2. The module is equipped with two audio plugs 3,5 mm do of the same use. Wide voltage range, it can be connected with voltage from 524VDC. There are 7 MCU input interfaces on the module. Specification: Operating Voltage: 524VDC Operating Current: 68mA Power Port: 2.1*5.5mm female head male head DC power socket Audio port: 2*3,5 mm audio jack MCU input port: 7x pin 2,54 mm, 5 V GND D3 D2 D1 D0 STD Size: 63*40*13mm/2.48*1.57 * 0,51 inch Weight: 18 g/0,63 oz List of packages: 1 * DTMF generator module 1*50 cm male to male audio cable 3.5mm . AE11A04 DTMF Voice Audio Generator Module Dual