A keypad is a simple method of entering user input into your project.
Specifications:

1. dimensions: 7 x 7.7 x 0.1 cm
2. connection : 3 col - 4 row, 7 pin connection
3. cable length: 9 cm
4. weight: 6.25 g
5. library: keypad.h

vma300_a4v01.pdf