This is a membrane keypad that is very thin and may be stuck on to a surface. There is a removable paper back that reveals a sticky surface - similar to a sticky label. The connector will take a standard 0.1" (2.54mm) pitch pin head. e.g
The keypad is a 4x4 matrix crosspoint switch and can be directly interfaced to the BV4618 I2C & Serial LCD controller making a complete input output interface.