The new Sennheiser HD 4.40BT Wireless offers exceptional sound for every day listening with mobile devices. The comfortable closed-back, around-ear headset is powered by proprietary Sennheiser drivers that deliver a well-balanced, amazingly detailed sound with dynamic bass.

Features:

• Bluetooth 4.0 and aptX technologies to deliver exceptional wireless sound quality.
• Intuitive ear-cup mounted controls for changing tracks and for making calls via the integrated microphone.
• Up to 25 hour battery life and is supplied with connecting cable for battery-free listening
• Compatible with most smartphones & tablets

Specifications:

• Wearing Style: Around Ear
• Transducer Principle: Dynamic, Closed
• Connectivity: Bluetooth 4.0 / NFC Pairing
• Frequency Response: 18 – 22,000 Hz
• Impedance Active: 18 Ohms
• Sound Pressure Level (SPL): 113dB (Passive: 1kHz/1Vrms)
• Total Harmonic Distortion (THD): <0.5% (1kHz/100dB)
• Battery Specification: Li-ion Polymer Battery
• Pick-up pattern: Dual omnidirectional microphones
• Battery Specification: Li-ion Polymer Battery
• Battery Life: Up to 25 Hours
• Weight (headphones): 8.4 oz. (238 g)

In the Box:

• HD 4.50 BTNC Headphones
• Carry Case
• Audio cable with 2.5 mm and 3.5 mm jack plug
• USB charging cable with micro-USB connector
• IFE Adapters
• Quick guide