Surface Pro Signature Type Cover goes beyond traditional keyboards to add a touch of warmth and elegance to everyday tasks Constructed with Alcantara, a luxury fabric sourced from Italy, it features a soft, velvety feel Compatible with Surface Pro 4 and Surface Pro in rich colors that coordinate with Microsoft Surface Pen and Surface Arc Mouse Our Signature Type Cover is Ultra-slim, yet performs like a full, traditional laptop keyboard and has a battery life of up to 13.5 hours Compatible with Surface Pro , Surface Pro 4 , Surface Pro 3 , Surface Pro 6. Sensors - Accelerometer