Some aftermarket mobile headsets come in a standard 2.5 mm plug, so users have to purchase an additional adapter for their mobile phones; a USB headset for a computer also cannot be directly plugged into a phone's or portable media player's micro-USB slot.
Some aftermarket mobile headsets come in a standard 2.5 mm plug. Users have to purchase an additional adapter for their mobile phones. A USB headset for a computer also cannot be directly plugged into a phone's. A USB headset for a computer also cannot be directly plugged into portable media player's micro-USB slot.