I purchased this at a home center and left it unused for about a year. I have confirmed that the battery charges and the device operates, but I have not used it for any processing. Product Details: Brand: KYOCERA Power Source: Rechargeable Maximum Rotational Speed: 2200 RPM Voltage: 12 Volts Color: Red Included Components: Driver bit (No. 2 x 65mm), Carrying case, Battery pack (Model No. B-1203M1) (2), Charger (Model No. BC-1205) Features: Rechargeable Product Dimensions: 18.3 length x 6 width x 23.6 height cm Speed Settings: 2 Speed: 2200 RPM