✔ 16 Keys configured into a 4x4 matrix
✔ Arduino and Raspberry Pi compatible
✔ Switch pad has 8 pin female header on end of flat cable
✔ White sticker on back can be peeled off for adhesive mounting

✔ Specifications:

✔ Contact resistance: 500 ohms
✔ Insulation resistance: 100M ohms
✔ Key Operating Force: 150-200N
✔ Rebound time: 1 (ms)
✔ Push button Life: 100 million (times)
✔ Operating Temperature: -40c ~ 60c
✔ Circuit Rating: 35V (DC), 100mA, 1W
✔ Contact resistance: 10 ohms ~ 500 ohms
✔ Varies according to the lead lengths and different from those of the material used
✔ Dielectric Strength: 250VRms (50 ~ 60Hz 1min)
✔ Electric shock jitter: