ri-focus LED provides ideal illumination of the examination area with a 40 cm distant, focusable, white and cold light with5500 Kelvin and 7100 lux. The LED lamp employed has a life of approx. 15, 000 hours and can be supplied with power using standard commercial AAA batteries, long-life lithium batteriesor NiMH rechargeable batteries plus plug-in charger, so that no annoying power cord need be used during the examination. Headband version, with built-in battery compartment and integral charge jack, can be optionally fitted with 2 lithium batteries size CR 123 A, 4 batteries size AAA (alkaline) or 4 rechargeable batteries size AAA (NiMH).Headband cleaning made easy by inner, removable and washable padding.Particularly comfortable with balanced, infinitely adjustable headband.Onoff switch on battery compartment.Charge jack for plug-in charger integrated in battery compartment.Focusable LED lamp at a distance of 40 cm approx. 40 mm - 200 mm, infinitely adjustable.White LED, 1 Watt with 5.500 Kelvin, 6 V.Battery operation: approx. 30 hrs. with lithium batteries, approx. 90 min. with alkaline batteries Type AAA.Rechargeable battery operation: approx. 90 min. with fully charged battery.Weight: 210 g without batteries, 242 g with CR 123 A lithium batteries, 259 g with rechargeable AAA batteries.