Easy to clean keyboards, etc. It can be opened and discarded easily. Includes a cleaning brush for collecting debris Power supply: Requires 2 AA alkaline batteries (sold separately); Size: Main unit: Diameter 3.3 x Height 2.3 inches (8.3 x 5.8 cm); Cleaning brush: Total length: Approx. 2.2 inches (5.5 cm); Material: Main body: ABS resin, polypropylene, brush part: nylon, cleaning brush: Polypropylene, nylon