TTP224 4-way Capacitive Touch switch Digital Touch Sensor Module Arduino Specification: 1. onboard TTP224 capacitive touch sensor IC 4 keys 2, 4 board-level status indicator 3, working voltage: 2.4V-5.5V 4, the module can set the output mode, the key output mode, the maximum output time and fast / low power selection 5, PCB board size: 35 (mm) x29 (mm) Package Included: 1PCS*TTP224 4- Channel Digital Touch Sensor Module Capacitive Touch Switch Button