5x Dc 3.7v 5v 1.2w White Led Light & 1x 3.5-5v 2a Touch Switch Led Driver Controller For Usb Mobile Power 18650 Lithium Battery - Integrated Circuits - AliExpress
Riester 2200-203 Elitevue Otoscope, Led, 3.5V, With C-Handle For 1 Rechargeable Li-Ion Battery
Mentor 2660.8303 LED indicator light RGB Lens: 3 mm 2 V, 3.5 V, 3.5 V 20 mA, 20 mA, 20 mA | Conrad.com
UV Ultraviolet LED 5mm 400nm 3.5V | xUmp
3.5V LED Light Bulb / Lamp for Riester Otoscope and Ophthalmoscope – Medline Industries, Inc. Diagnostic set builder
OPTOSUPPLY - 8 mm Clear Blue Led Diode 14400 ... 18000 mcd 30º 50mA 3 ... 3.5V - OSB56L8131P
Thomsen LED-5-BL-1,8-WS-750 LED wired White Circular 5 mm 750 mcd 130 ° 3.5 V | Conrad.com
Riester 3.5V LED Light Bulb / Lamp for Riester Otoscope and Ophthalmos — Grayline Medical
KaWe LED high power bulb 3.5 V for all EURO-/COMBILIGHT F.O. 30 LED otoscopes