ITEM NAME:4x5 Matrix Array 20 Key Membrane Switch Keypad Keyboard Keys for arduino JfJ Nw Product description: 1. Panel Size: 75*85mm. 2. Length: 18CM. 3. Insulation Resistanceï ¼Å¡100M ÃŽ © 100V. 4. Withstand Voltageï ¼Å¡250V Rms.(50-60Hz lmin) 5. Storage Temperature: +15℃- +35℃. 6. Storage Humidityï ¼Å¡70ï ¼â€¦-90ï ¼â€¦. Package Included: 1PCS* 4x5 Matrix Array 20 Key Membrane Switch Keypad Keyboard 4*5 Keys for Arduino.Panel Size: 75 85mm. Storage Humidityï ¼Å¡70ï ¼â€¦-90ï ¼â€¦. Length: 18CM. Storage Temperature: +15℃- +35℃.