User Benefits Electric speed control ( 2 speed) Dust collection (Dust bag, forced dust collection) Tool-less paper clamp Cordless mobility allows for stress free sanding Compatible with the base and the 4 pads used for the current corded models Square Pad with Hook loop fastener Square Pad without Hook loop fastener Rectangular pad for louvered door sanding, with Hook loop fastener Extended, triangular pad for louvered door sanding, with Hook loop fastener High power, the same or higher work efficiency than BO4555/BO4556 in rough finish sanding of wood Low vibration – Redesigned balancer reduces the tool vibration in loaded operation, down to the same level or lower than that of competing models Easy to operate paper clamp Ergonomically contoured grip Self dust .