The module is based on a touch-sensing IC (TTP223B) capacitive touch switch module. In the normal state the module output low low power consumption; When a finger touches the corresponding position the module output high if not touched for 12 seconds switch to low-power mode.
Jog type : the initial state is low high touch do not touch is low ( similar touch of a button feature )
Module can be installed in such as surface plastic glass of non-metallic materials
In addition to the thin paper ( non-metallic ) covering the surface of the module as long as the correct location of the touch you can make hidden in the walls desktops and other parts of buttons

Features:
Low power consumption
Power supply for 2 ~ 5.5V DC
Can replace the traditional touch of a button
Four M2 screws positioning holes for easy installation

Specification:

• Item	Min	Typical	Max	Unit
  Power supply voltage VCC	2.0	3	5.5	V
  Output high VOH	-	0.8VCC	-	V
  Output low VOL	-	-	0.3VCC	V
  Output Pin Sink Current ( VCC = 3V VOL = 0.6V)	-	8	-	mA
  Output pin pull-up current ( VCC = 3V VOH = 2.4V)	-	4	-	mA
  Response time (low power mode)	-	-	220	mS
  Response time (touch mode)	-	-	60	mS
  Size	24x24x7.2			mm

  Touch Sensor Interface :(the last picture show)

  -Control Interface : A total of three pins (GND VCC SIG) GND to ground VCC is the power supply SIG digital signal output pin ;
  
  -Power Indicator : Green LED power on the right that is shiny ;
  
  -Touch area : Similar to a fingerprint icon inside the area you can touch the trigger finger .
  
  -Positioning holes : 4 M2 screws positioning hole diameter is 2.2mm the positioning of the module is easy to install to achieve inter- module combination ;

Packaging Details
Unit Type: piece Package Weight: 0.100kg (0.22lb.) Package Size: 12cm x 12cm x 8cm (4.72in x 4.72in x 3.15in)