The Keeler range of Otoscopes give you exactly what you would expect from the Keeler name ? the highest standards of quality and reliability. All the Otoscope instruments have genuine Halogen illumination giving you clear and accurate aural images and incorporate the new slimline, lightweight, yet robust handle. Smooth and easy control of illumination is provided by the ring rheostat and there is full diagnostic capability from the four aural and one nasal permanent specula supplied. The diameter of these specula?s is 2.5, 3.5, 4.5, 5.5 and 8.0mm respectively. In addition lithium ion technology provides a longer life battery and faster charge capability so your instrument lasts longer. Lithium batteries are the newest technology batteries and have a range of benefits over the traditional NiMH and NiCd batteries. These benefits include being lighter, typically 20-35% lighter, and enhanced performance, approximately 10-20%, compared to a Ni-MH battery of the equivalent mAh rating. Another unique feature of the lithium ion batteries are that they are not susceptible to the ?memory effect?