Refills are interchangeable between manual/electronic dispenser and no batteries required for increased reliability and lower operating costs. Adjustable dosage settings: 0.4, 0.8, 1.2 mL. Uses the same metal key for the entire Transcend family. Use with: T700E2, T700FS, T70FFS, T70HBFS, T710AFS, T740AS, T750S, T770GS. 4.0" D x 10.75" H.