Black & Decker BDCROS18-GB. Sander type: Random orbital sander, Product colour: Black, Orange. Idle speed (max) : 12000 RPM, Oscillating orbit diameter: 1.3 mm, Sound power level: 82.5 dB. Power source: Battery, AC input voltage: 230 V, Battery technology: Lithium-Ion (Li-Ion) Sanding disc diameter: 12.5 cm