This is a 4x4 matrix sixteen key membrane switch keypad that is easy to use and will look nice in your project. It has 8 outputs, you should use the “Scan mode” to judge which button has been pressed down.SpecificationPad Size: 70 * 77 * 0.8mmCable Length: 85mm(include connector)Connector: 8 pins female header, 2.54mm PitchMax Circuit Rating: 35VDC, 100mAInsulation Spe: 100M Ohm, 100VDielectric Withstand: 250VRms (60Hz, 1min)Contact Bounce: <=5msLife Expectancy: 1 million closuresOperation Temperature: -20 to +40 °C