Description Model: T4Z24AA Power: One battery + 2 Ion coin cell batteries System requirements: Windows 8.1 Dimensions (H x L x W)147.29 x 9.5 mm (5.79 x .37 in) Weight: 17.5 g (.61 oz) Tip diameter: 1 mm Buttons: Yes 3 Pressure sensitivity: Yes (2048 levels) Tilt operation: Yes Palm rejection: Yes Hover reading height: 8mm+ Operating temperature 5 to 40 C (41 F to 104 F) Operating humidity 30 - 80 % Storage temperature -10 to 55 C (14 F to 131 F) Storage humidity 30 - 80 % Pen technology Material: Metal colour: as shown Package Contents: 1 x Stylus Pen 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.