1.8P head, spacing 254mm can be inserted on the pin header to link the circuit, the back of the keyboard can be firmly pasted on the surface of the chassis after the color sticker is peeled off 2. Operating pressure metal type 220-350g 3. The film button life is less than 500,000 times Mechanical Rigidity: Flexible Layers: single side Base material: Nickel Insulation material: organic resin Insulation Thickness: Thin Board Flame retardant properties: VO board Processing technology: electrolytic foil Reinforcement v glass fiber cloth base Insulating resin: phenolic resin Product nature: new product Colour:As Shown Material:plastic Package Contents: 10 x MCU External Expansion Keyboard Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.