Escolite Reusable LED Penlight with Pupil Gauge for medical Nurse LED color :White. Shell color: Green and Blue 2pcs in pack. Sealed concentric beam,Imprinted pupil gauge,protable in pocket. Activated by depressing cap button,replaceable 2 pcs AAA batteries(Included). Size:13.7cm (5.4")Length x 1.23cm(0.48")diameter.