Introduction: Front-panel/keys materials: 304 stainless steel Baseboard material: aluminium Keys: laser engraved or chemical corrosion to avoid the characters falling off or being friction losses. Switch contact material: silicone switch technology pcb. Supply voltage: +5v dc Color:white Size: 392*110(mm) Properties of products: Key lifespan: >2 million times Key press force :3~5n Key travel:5 years Warranty: 12 months from date of start-up or 15 months from date of dispatch ex-works shenzhen, whichever shall first occur. G.W: 1.7kg Packing: in carton (49*18*6cm)