Blue Tees' Most Advanced Laser Ever. The Series 4 Ultra is Blue Tees' new high end, premium laser rangefinder. S4 Ultra boasts their 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. Features: OLED Display Active Track Brightness Control Advanced Flag Lock Auto-Depth Filter Pulse Vibration Ultra Magstrip 1200 Yard Range Slope Switch IP54 weather resistant Auto-Depth-Filler Be in control. Never miss the flag again. Powered by the cutting-edge Auto-Depth Filter, S4 Ultra eliminates distractions to deliver razor-sharp accuracy. Whether it’s uphill, downhill, or through hazards and trees, you’re always in control of your game. OLED Display. See the course like never before. The vibrant OLED Display brings every measurement to life, even in bright sunlight. Clearer visuals mean better decisions for your best game yet. 4TH Gen Slop Switch. Conquer every angle with just one switch. Dominate hilly courses with the Slope Switch feature. Toggle slope-adjusted distances on and off with ease—play smart, and stay tournament legal. Brightness Control. Perfect visibility. Never compromise your view. Don’t let glare or low light hold you back. The Brightness Control feature puts you in charge, delivering clear visuals from dawn to dusk. Active Track. Experience unparalleled clarity and precision on the course with the advanced Auto-Depth Filter. This innovative technology automatically adjusts the focus, filtering out background distractions to lock onto your target with ease. Magnetic Mount. A built-in magnet with two powerful magnetic plates enables an effortless, ultra-strong hold to your golf cart or accessory. Slope Switch. The Slope Switch enables the golfer to see slope compensated distances on the display. It can be toggled on or off to comply with USGA regulation. What's In The Box?: S4 Ultra Rangefinder Microfiber Cleaning Cloth Weather-Proof Carrying Case Lanyard (3) CR2-3V Batteries Blue Tees Sticker Mountaineer Buckle Quick Start Guide & Insert