Sennheiser HD 4.40BT Wireless Headphones

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. Height: 7.8 inch / 19.8 centimeter
• Product Dimensions: 7.1 x 3.9 x 10.2 inches. Connectivity Technology: Wireless; Battery Type: Li ion Polymer Battery

Specifications

• Brand: Sennheiser
• Model: ‎HD 4.40BT
• Impedance: 18 Ω
• Frequency response (Microphone): 100 – 10,000 Hz
• Frequency response (Headphones): 18 – 22,000 Hz
• Sound pressure level (SPL): 113dB (Passive: 1kHz/1Vrms)
• THD, total harmonic distortion: <0.5% (1kHz/100dB)
• Pick-up pattern (Microphone): Dual omnidirectional microphones
• Battery Specification: Li-ion Polymer Battery
• Codecs: AptX