Description:TTP224 4-way Capacitive Touch switch Digital Touch Sensor ModuleSpecification:1. onboard TTP224 capacitive touch sensor for IC 4 keys2, 4 board-level status indicator3, working voltage: 2.4V-5.5V4, the module can set the output mode, the key output mode, the maximum output time and fast / low power selection5, PCB board size: 35 (mm) x29 (mm)