Firmware: These dongles are pre flashed with for watchman firmware and function similar to for Steam Controller, or for tracking device dongles. Wide Compatibility: Used to pair the following devices with your PC VR settings: for Controllers, for Tracking Device, for Controllers, for VR Ink Pilot, for N7R Tracking Device)NOT FOR REVVL 4 PLUS). Plug and Play: Just insert into your computer and the necessary drivers automatically install so you can pair your controllers using for SteamVR app. Reliable and : Each USB Dongle receiver for Controllers is tested before shipment to their function flawlessly. Compact and Portable: This USB dongle receiver is compact in size and light in weight, so you can easily carry it with you for outdoor use. Colour:White Material:plastic Package Contents: 2 x Steam VR USB Dongle Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.