Easy to connect and compatible with all 1st Gen HTC VIVE headsets. Model: VIVE Earphones. Official & Compatible: Designed for HTC VIVE systems, plugging into the headset's 3.5mm audio port. Modular: Works with headsets that have detachable earphone options, like the Cosmos Elite, and can be used with other VIVE models with a 3.5mm jack, such as the Focus 3.
eBay