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Fits all Welch Allyn 3.5-V instrument heads
120 minutes of operation between charges
Rheostat for intensity control section
With battery generator indicator: once the battery is fully discharged, the low battery indicator may flicker
Lithium Ion Battery included (WAL71960)
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WAL71900USB: with USB Charging Module and USB Charge Cord - USB Micro-B port
WAL71900USB: charging indicator on the USB charger will blink during charging and then stay on when the battery section is fully charged
WAL71900USB: USB charging module full charge time = 18 h
