Features: This keypad is designed for Raspberry Pi and supplies your Pi with 16keys. It has an I2C communication modes and uses 2.4-5.5V supply voltage- with a power indicator. Onboard- TTP229 capacitive 16-key touch- sensor IC-. Adopt capacitive touch- chip TTP229 -LSF, the touch-IC supports 16 touch- buttons, touch- sensitivity adjustable, built-in LDO When all the keys- for a-period of time- (around 4.0 seconds) have not been touch-, chip system will recalibrate. Allows you to remove the worry of conventional push-type keys-. Specifications: Material:PCB Chip: TTP229-LSF Interface: I2C Number of valid keys: 16 Sampling rate: 8Hz Antistatic capacity HBM: 6KV Working voltage: 2.4V to 5.5V Working temperature: -40 to+85 Storage temperature: -50 to+125 Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Touch Sensor Keypad