About Product:Brand: neutral article number: KD27 transmission range: 10 meters function: support music, phone, NFC function, power, according to a multipoint connection bluetooth protocol: 4.2 track: stereo way of use: whether wearing type single and double ears: bilateral stereo applicable gift-giving occasion: a wedding, business gifts, fairs, employee benefits, housewarming color: black, grey, blue, red, gold support custom: support