Hearkeen Are Versatile ABS & Silicon Headphones, Perfect for Those Everyday Moments in Life. Bt 50 Transmission Increases the Practicality of This Head Set, with a Cordless Range of Up to 10 M. They Have a Frequency of 20Hz-20Khz & 5Mw (16O) of Power. Features Include a Button to Answer Calls, Volume Control & Connection to the Playlist of a Mobile Device. the Battery Capacity is 90Mah & the Autonomy in Use is Up to 8H & the Standby Time is Up to 6 Days. Includes Cable. Supplied in a Gift Box. Earphones (Each): 33 x 16 x 24 Mm | Neck Band Length: 455 Mm | Box: 201 x 220 x 40 Mm; Certificates Available: Msds, Red, Reach Minimum Quantity: 1