Based on the Tracker LT model, the Tracker RX 3.5×40 offers dual magnification options via the included 1.7x lens converter. The unit is fitted with a single IR illuminator for use in very low light/total darkness. Each Tracker model is fitted with two high grade Gen 1 image intensifier tubes that are colour and gain matched for optimum performance. The wide exit pupil diameter from each ocular negates the need for interpupillary adjustment, which in turn gives a less complicated but stronger bodyshell design. A contoured one-piece wrap-around eyecup prevents external light intrusion and the permanently attached Eclipse™ objective lens caps can be rotated and opened right back along the body to prevent loss or obstruction. Both models have a built-in IR illuminator for use in very low light and total darkness and benefit from a tactile green/black sure-grip ABS plastic bodyshell with partial rubber armouring for added protection and hold. The Tracker 3×42 has the greatest standard magnification in the Tracker night vision binocular range featuring 3.0x image magnification and a 20° field of view. It also benefits from independent objective lens focusing for improved image sharpness. The Tracker RX 3.5×40 is the most versatile model in the Yukon Tracker range, being essentially a Tracker LT 2×24 packed with a 1.7x Lens Converter, offering either 2.0x magnification with a 30° field of view or 3.5x magnification with a 15° field of view. Powered from a single 3v Lithium CR123A battery (not included) they feature twin operational status LED’s that illuminate green and red depending on the active features and both models come with a detachable neck strap and a stylish soft carry case.