HTC VIVE Flow Virtual Reality Glasses. Design and Weight: Innovative and extremely lightweight design (weighing only about 189 grams). Display Resolution: Sharp resolution up to 3.2K with a wide 100-degree field of view and a 75Hz refresh rate. Audio: Dual built-in speakers with Spatial Audio technology and microphones with noise and echo cancellation. Cooling and Design: Integrated active cooling system for eye ventilation for complete comfort during use. Built-in Vision Adjustment: Contains adjustable diopter lenses for nearsightedness without the need to wear prescription glasses underneath. Uses: Ideal for watching movies, presentations, meditation, and productivity by connecting directly to a smartphone via Bluetooth/Wi-Fi and using the phone as a controller. The glasses are almost new and excellent, very light use, maybe two or three times.