🧱 Device Monitors 🏗️ Manufacturer Insignia™ #️⃣ Model No. NS-50DF710NA19 Best Buy SKU: 6245704 Port(s) HDMI HDMI HDMI Year 2018 Video Technology UHD 4K (3840 × 2160) LED UPC 600603233951 Operating System(s) FireOS As the NS-50DF710NA19 uses Fireos , applications can be side-loaded USB/Network documentation below. 📖Documentation/Manuals: Insignia™ NS-43DF710NA19/NS-50DF710NA19/NS-55DF710NA19/NS-58DF620NA20/NS-50DF711SE21 Quick Setup Guide How to Sideload Apps on a Fire TV or Fire Stick (Step-by-Step) (2026)