Feature: 1. Plug and Play: Just insert into your computer and the necessary drivers will automatically install so you can pair your controllers using for SteamVR app. 2. Firmware: These dongles are pre flashed with for watchman firmware and function similar to for Steam Controller, or for HTC Vive tracking device dongles. 3. Compatibility: Used to pair the following devices with your PC VR settings: for Valve Index Controllers, for HTC Vive Tracking Device, for HTC Vive Controllers, for Logitech VR Ink Pilot, for N7R Tracking Device（NOT FOR REVVL 4 PLUS). 4. Reliable and Durable: Each dongle is tested before shipment to ensure their function flawlessly. 5. 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. Specification: Item Type: USB Dongle Receiver Material: ABS Gross Weight: 8g / 0.3oz For SteamVR dongle is used to pair the following devices with your PC VR settings: for Valve Index Controllers, for HTC Vive Tracking Device, for HTC Vive Controllers, for Logitech VR Ink Pilot, for N7R Tracking Device（NOT FOR REVVL 4 PLUS） Features: USB dongle wireless receiver, used to pair your PC with SteamVR compatible devices, allows you to use for HP Reverb headset and for Valve Index controller. Package List: 1 x USB Dongle Receiver