The Series 4 Ultra is our new high end, premium laser rangefinder. S4 Ultra boasts our most advanced technology to date, unparalleled flag lock capability up to 350 Yards, industry leading electronics and construction, an OLED display and an IP54 weather resistant rating. OLED Display: The rangefinder features a high-resolution OLED display that is clear, bright, and easy to read in all lighting conditions, from bright sunlight to low-light situations. You can also manually adjust the brightness for optimal viewing. 6x Magnification: It offers 6x magnification, which helps you easily spot and lock onto your target. Auto-Depth Filter: This technology helps distinguish the flag from background objects like trees or hills, improving accuracy and making it easier to lock onto the pin.