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Mercury HS 109 is a wired headphone with a cable length of 2.2 meters. This headphone is built with Neodymium to produce higher sensitivity and substantial sound output using less power, according to the company and they produce music at quite a high SPL level (sound pressure level) with the use of high magnetic flux from Neodymium. The company claims that the sound definition produced and base performance on the HS 109 is 8 times better than a ferrite magnet.
It is a plug and play device, has a 40mm driver unit and a maximum power of 100mW.