Three-in-one headset delivers crystal clear sound when using Internet/VoIP, cordless or mobile phones (2.5mm). Simple Plug and Play. No drivers needed. Noise-canceling microphone and echo reduction filters out unwanted background sounds. Single-ear design for easy side conversations and listening to your surroundings while working. Easily adjust volume and mute with one-touch controls. Ideal for a noisy home environment. Headset offers comfortable, stable, over-the-head fit for all-day wear. Headset includes USB adapter for Internet phones.