THE DIAGNOSTIX 5410L 3.5V PORTABLE DIAGNOSTIC SET INCLUDES A STANDARD OTOSCOPE AND A COAX OPHTHALMOSCOPE. DIAGNOSTIX 3.5V STANDARD OTOSCOPE HEAD FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" FIBER-OPTIC LIGHT TRANSMISSION FOR AN UNOBSTRUCTED VIEW OPTICAL GLASS REDUCES REFLECTION AND PROVIDES 3X MAGNIFICATION BIDIRECTIONAL SWIVEL LENS ALLOWS INSTRUMENTATION INSUFFLATOR PORT FOR PNEUMATIC OTOSCOPY. COMPATIBLE WITH WELCH ALLYN SPECULA UNIVERSAL BAYONET MOUNT FOR COMPATIBILITY WITH OTHER BRANDS OF 3.5V POWER SUPPLY HANDLES ANTI-THEFT LOCKING FEATURE IS STANDARD ADVANCED ADLED ILLUMINATION DIAGNOSTIX 3.5V COAX OPHTHALMOSCOPE HEAD FEATURES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" HIGH PERFORMANCE ASPHERICAL CONDENSER LENS REDUCES CORNEAL REFLECTION FURTHER REDUCTION PROVIDED BY UTILIZING DISTINCT PARALLEL OBSERVATIONAL AND ILLUMINATING LIGHT BEAMS (GULLSTRAND'S PRINCIPAL) ERGONOMIC DESIGN AND INTEGRAL THUMB REST IMPROVES STABILITY AND ALLOWS ONE FINGER CONTROL OF ALL FUNCTIONS SYNTHETIC RUBBER BROW REST FACILITATES USE WITH PRACTITIONER EYEGLASSES DUST PROOF MAGNIFIED/ILLUMINATED APERTURE VIEWING WINDOW UNIVERSAL BAYONET MOUNT FOR COMPATIBILITY WITH OTHER BRANDS OF 3.5V POWER SUPPLY HANDLES ANTI-THEFT LOCKING FEATURE IS STANDARD ADVANCED ADLED ILLUMINATION 29 VIEWING LENSES FROM -35 TO PLUS 40 (PLUS 1-10 12 15 20 40 MINUS 1-10 15 20 25 30 35) 24 APERTURE/FILTER COMBINATIONS FOR IMPROVED VERSATILITY SET INCLUDES UL STYLE""MARGIN-TOP0PX; PADDING-TOP 5PX; PADDING-BOTTOM 5PX;"" 3.5V DIAGNOSTIX STANDARD OTOSCOPE 3.5V COAX OPHTHALMOSCOPE LI-ION ADTRONIC BATTERY HANDLE FOR IMPROVED PERFORMANCE 30 HOURS CONTINUOUS USE BETWEEN CHARGES AND 1200 CHARGING CYCLES HARD CASE HOLDS INSTRUMENTS SECURELY TWO-YEAR WARRANTY ON INSTRUMENT HEAD AND HANDLE LIFETIME WARRANTY ON LED LAMP