The Roku Streaming Stick 4K 3810R is a high-quality streaming device that offers 4K resolution with HDR10+ and Dolby Vision, providing an immersive viewing experience. With its voice remote, users can easily navigate through their streaming services and apps. This dongle connects to the TV via HDMI and offers Wi-Fi connectivity for seamless streaming. Made by Roku, a trusted brand in media streaming, this device is perfect for those looking to enhance their TV viewing experience with top-notch audio and video quality. Preowned – Tested and Working. Comes with rechargeable batteries that need to be charged.