Keypad 4×4 Matrix 16-Key Membrane Switch Button for Arduino Raspberry PI

Features 

Ultra-thin design
Adhesive backing
Excellent price/performance ratio
Easy interface to any microcontroller
 

Specifications 

Maximum Rating: 24 VDC, 30 mA
Interface: 8-pin access to 4x4 matrix
Operating temperature: 32 to 122 °F (0 to 50°C)
Dimensions: Keypad, 2.7 x 3.0 in (6.9 x 7.6 cm) Cable: 0.78 x 3.5 in (2.0 x 8.8 cm)

8 pin connector
Adhesive mounting
Maximum Circuit Rating: 35VDC, 100mA
Insulation Resistance: 100M Omh, 100V
Dielectric Withstand: 250VRms (50-60Hz, 1min)
Contact Bounce: <=5ms
Life Expectancy: 1 million closures
Operation Temperature: 0 to 70 centigrade
Humidity: 40 centigrade, 90%-95%, 240 hours
Pad Size (L x W): Approx. 3 x 2.7 inch / 76 x 69 mm
Flexible Circuit Length: Approx. 3.3 inch / 83 mm

Application Ideas
Security systems
Menu selection
Data entry for embedded systems