Sennheiser HD 4.40 BT

Bluetooth 4.0 and aptX technologies to deliver exceptional wireless sound quality
Over-the-ear design, For a secure fit.
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

Impedance: 18 Ω
Frequency response (Microphone): 100 – 10,000 Hz
Frequency response: 18 – 22,000 Hz
Sound pressure level (SPL): 113dB (Passive: 1kHz/1Vrms)
THD, total harmonic distortion: <0.5% (1kHz/100dB)
Pick-up pattern: Dual omnidirectional microphones
Battery Specification: Li-ion Polymer Battery
Product Dimensions: 7.1 x 3.9 x 10.2 inches
Codecs: AptX