1. WIDE COMPATIBILITY: The usb adapter 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) 2. EASY OPERATION: This USB dongle receiver is compact in size and light in weight, so you can easily carry it with you for outdoor use, plug and play 3. PLUG AND PLAY: Just insert into your computer and the necessary drivers automatically install so you can pair your controllers using for SteamVR app 4. FIRMWARE: These dongles are pre flashed with for watchman firmware and function similar to for Steam Controller, or for tracking device dongles Color: Black Material: plastic Package Contents: 2 * 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.