The Welch Allyn PanOptic Diagnostic Set 97200-MPS delivers the latest in diagnostics technology, complete with a 11810 3.5V PanOptic Ophthalmoscope, a 23820 MacroView Otoscope, and a 71900 Lithium Ion Rechargeable Handle. The handle averages 120 minutes of on-time between charging, twice the standard and comes with a low-battery indicator and no "memory" effect.