... cleanHandle is co-used for HS-XX10 system4 tips 2 AA batteries used SW-OT04Fiberoptics for cool, obstruction free light transmission ... age thermoplastic Swivelling viewing window with 2.5x magnification "AA"polycarbonate battery handle interchanges with SW-OT05 Ophthalmoscope Pocket ... 2.5mm,4mm Bulb : 2.5V1.6W halogen lamp Batteries : two "AA" batteries or two "AA" NiMH Rechargeable Battery SW-OT14