Dispensing system features a power-efficient， touch-free operation to encourage use and minimize any risk of cross-contamination. Versatile design lets you use it on walls in washrooms， corridors and hallways， or on a stand (sold separately). Power provided by four D batteries will provide up to 5 years of operation in typical usage conditions. Infrared sensing technology provides reliable operation to prevent misfiring. An optional catch tray (sold separately) can be integrated to prevent product from landing on floors. Dispensing system is designed for S.C. Johnson Professional foaming hand hygiene products (sold separately).