iQ Sensor? technology offers consistent paper dispensing, fewer misfires and length delay adjustment. System features replaceable drive module and downloadable usage to PDA. Holds up to 8" roll. Automatic transfer reduces stub roll waste. Touchless design reduces risk of cross-contamination. Extended battery life (requires 4 D alkaline batteries, not included). Self-adjusting sensing field. Does not allow free pulling of paper. Dual mode functionality: set to iQ Sensor? or paper hanging out.