The TTP224 is a touch pad detector ic which offers 4 touch key. The touching detection ic is designed for replacing traditional direct button key with diverse pad size. Capacitive touch allows electronics to sense when your finger is within a few millimeters of the surface to simulate a button "press" just like how the push button works. Features: On-board ttp224 capacitive touch 4 key ic on-board 4 road level indicator. Working voltage: 2 v to 5. 5 v DC adjustable output mode, key output mode, longest time and fast/low power output pieceb board size: 35(mm) x29 (mm). 4-way Capacitive Touch switch The Touchpad has 4 numbered touch contacts and 4 indicator red LEDs. The panel has 4 outputs with a logic level. When touching the touch contact, a logical unit appears on the corresponding output and the red indicator LED turns on. In the initial position, there is a logical zero on all outputs of the touch panel. The scope of use of such devices is quite wide: the inclusion of a bell, the light switch, the management of electronic devices, the alarm for a house, a group of alarm sensors, and so on. When necessary, the use of the sensor allows the concealed placement of the switch. The designation of the six-pin connector: VCC-contact for connection of the supply voltage from 3 to 5 Volts. GND-contact for connecting the common wire. OUT1- digital output from the first touch contact. OUT2- digital output from the second touch contact. Dimension: 35 x 29mm. Package Content: 1 x TTP224 4 way switch touch sensor capacitive digital touch sensor module.