A4Tech Folding Headset, Best ideal for travel

Folding structure - Foldable design for portability and easy storage
Adjustable headband - Light-weight and adjustable headband for an optimum fit and long-term comfort
40mm high performance driver unit - Superior NDFeB magnet driver unit for stunning clarity and a bass impact you can feel
Omni-directional microphone built-in - Picks up sound any direction with remarkable clarity
Inline volume control with MIC mute - Control volume and mute microphone form a distance

Specifications:
Speaker: 40 mm
Frequency range: 20 Hz-20 kHz
Impedance: 32 Ohm
Sensitivity: 102 dB
Cable length: 2 m
Plug: 3.5 mm