We have had 8 of the penlight thus far, ordered for my colleagues from elsewhere.
All have worked perfectly for what is deemed to be A disposable unit.
A small thin barrel / biro type casing with batteries sealed inside, material is a creamy off white colour, pupil gauge printed on the side of the barrel.
Lighting the led is via the nub (end) of the unit, which will turn off upon release.
Good value for money, shame we nurses have resorted to buying our own kit as it speeds up and our already busy workload allowing us to help folk, saving us important minutes per shift by not scrabbling around for kit that is either broken or simply not provided by supposedly top rated NHS / private wards such as mine.
Great kit & recommended! ..as is a sharpie pen to write your name on it as dr's & other staff will "forget" to give you kit back!
Don't get ill folks!