A capacitive sensor is a touch sensor that requires little or no force to activate. Detects body capacitive touch, outputting analogue voltage.
Specifications:

1. connection: 3 pins, GND - VCC - Signal
2. voltage: 3 to 5 VDC
3. dimensions: 30 x 16 x 6 mm
4. weight: 5 g

wpse305a4v01.pdf

ce_rohs_open.pdf