Product basic info Primary colours: Grey Primary detailed colours: Metallic silver Additional colours: Blue Diameter unit: 13 mm Height unit: 25.2 mm Weight unit: 7.6 g Technical data Battery capacity: 145 mAh Power supply Number of batteries: 1 Battery voltage rating: 6 V Battery composition: Lithium, Silver-Oxide Battery IEC size: 4SR44 (4LR44 ,110-150, 170-200, PX28A, A544, K28A, V34PX, 28L) (EN)