What's in the box:

DTMF Module 5-24VDC Audio Generator Module Voice Dual Encoder Transmitters Board Keyboard for MT8870/CE004/CE005/CE023/AD22B04/AD22A08 (Standard)

Features:
The module is designed for dialing keyboard and MCU interface.
Can instruct MCU(or keyboard) to generate 16 dual tones from Audio 1/2.
The DTMF module equipped with two 3.5mm audio plug for same times using.
Wide voltage range,you can connect it with voltage from 5~24VDC.
There are 7 MCU input interface on the module.

Specifications:
Material: PCB
Working voltage: DC5-24V
Working current : 6-8mA
Item weight: 16g / 0.56ounce
Package weight: 20g / 0.71ounce
Package size: 63 * 40 * 13mm / 2.48 * 1.57 * 0.51in

Packing List:
1 * DTMF Module