1. （头戴式）耳机，耳麦
A headset is a small pair of headphones that you can use for listening to a radio or recorded music, or for using a telephone.

2. 头戴式视图器
A headset is a piece of equipment that you wear on your head so you can see computer images or images from a camera in front of your eyes.

1. receiver consisting of a pair of headphones