HEINE Standard F.O. 4 LED NT Laryngoscope Handle with handle shell and laryngoscope insert with LED-Technology. LED in HQ: The new standard in LED illumination defining optimal light intensity, homogeneity and colour rendering for the most accurate visualisation. Red is red, blue is blue. Colour temperature: typically 5,200 K. Exclusive Fade-Out Function: The Standard F.O. LED Laryngoscope Handle provides maximum brightness at constant intensity. As soon as the dry cell batteries or the rechargeable battery reach a low level, the LED Laryngoscope Handle electronically releases a visible early indication of low battery status: By gradually reducing brightness (Fade-Out Function), the LED Laryngoscope Handle starts notifying the user to replace batteries or to charge the handle. HEINE Standard F.O. 4 LED NT Laryngoscope Handles can be converted from battery to rechargeable handles by simply exchanging the bottom insert. Compatible with all Laryngoscope Blades to the ISO 7376 (green standard)..