Tech specs

Compatibility 
Surface Book
Surface Book 21,3
Surface Studio 1st Gen3
Surface Studio 23
Surface Laptop 1st Gen1
Surface Laptop 21
Surface Go1,3
Surface Pro 31
Surface Pro 41
Surface Pro 5th Gen1,3
Surface Pro 61,3
Surface Pro 71,3
Surface Pro X1,3
Surface 31
Pen Tip Kit1
Connector type Bluetooth 4.0
Buttons Barrel button and tail eraser
Color Platinum, Black, Burgundy, Cobalt Blue, Aqua2
Dimensions 5.75 x 0.38 x 0.38 in (146.1 x 9.7 x 9.7 mm)
Weight 0.04 lbs (20g)
Battery AAAA battery included

[1] Sold separately. 

[2] Available colors vary by market. 

[3] Surface Pen tilt functionality is available. May require updated firmware.